High-temperature and high-pressure resistant silicone defoamer and preparation method thereof

Abstract

The application discloses a high-temperature and high-pressure resistant silicone defoaming agent and a preparation method thereof. The defoaming agent is prepared from the following components in percentage by weight: 5-55% of polysiloxane silicone paste, 0.1-10% of spheroidal polyhedral oligomeric silsesquioxane, 0.3-25% of polyether modified polysiloxane, 1-25% of emulsifier, 0.1-5% of thickening agent, 0.05-0.3% of bactericide, and the balance of water, with the sum of the percentages of the components being 100%. In the formula, the cross-linked polysiloxane silicone paste provides superior defoaming performance, the spheroidal polyhedral oligomeric silsesquioxane has excellent thermal stability and chemical stability, and the 3D structure of the spheroidal polyhedral oligomeric silsesquioxane protects the silicone paste from being separated out in the emulsion, thereby improving the stability of the defoaming agent.

Description

Technical Field

[0001] This invention belongs to the technical field of organosilicon defoamers, specifically relating to a high-temperature and high-pressure resistant organosilicon defoamer suitable for the textile industry and its preparation method. Background Technology

[0002] During the chemical processing of textiles, various auxiliaries are used, such as penetrants, refining agents, leveling agents, dispersants, and fixing agents, which are surfactants. The mixing, transmission, and liquid conveying processes introduce air, generating a large amount of foam. This foam can cause various malfunctions, negatively impacting dyeing quality and severely affecting product quality, such as uneven dyeing, oil spots, and color differences, resulting in incalculable losses for dyeing and printing manufacturers. my country's textile dyeing and printing industry has a long history and has developed rapidly, serving as a vital industry for people's livelihoods. In recent years, due to increasingly stringent environmental protection requirements and the relocation of low-end industries, the country has accelerated its industrial upgrading efforts, striving to reduce wastewater, waste gas, and solid waste emissions. Defoamers play a significant and positive role in this process and have great development potential.

[0003] In textile printing and dyeing processes, defoamers are essential to avoid production and product quality problems caused by foam. Defoamers can quickly eliminate or prevent foam formation at various stages of the printing and dyeing process. Currently used defoamers are mostly water-based liquid formulations, primarily classified into three categories: silicone-based, polyether-based, and mineral oil-based. Silicone-based defoamers are silicone pastes synthesized with polysiloxane as the main component, combined with emulsifiers, thickeners, dispersants, bactericides, etc., through mechanical emulsification with water. Polyether-based and mineral oil-based defoamers are less commonly used in the textile industry due to their large usage and relatively low defoaming efficiency.

[0004] Organosilicon defoamers are currently the most widely used type of defoamer due to their low surface tension, good chemical stability, and excellent defoaming and foam-suppressing properties, making them the most widely used in the textile printing and dyeing industry. However, the siloxane backbone of organosilicon is easily broken in strong acid and alkali environments, and its strong hydrophobicity limits its application in industries such as bio-fermentation, papermaking, and printing and dyeing. For example, during the dyeing process, especially in polyester dyeing, the high dyeing temperature (130-140℃), high pressure (2-4 atmospheres), and strong alkalinity (pH 11-14) cause most organosilicon defoamers to demulsify under these high temperature and high pressure conditions, resulting in silicone oil adhering to the dyed fabric and forming silicone spots.

[0005] Based on the above problems, existing technologies have made many beneficial explorations to improve organosilicon defoamers, enabling them to be better applied in textile processing. For example, patent CN103603215B adds polyether-modified siloxanes with different HLB values ​​to an organosilicon composition in the presence of a catalyst. By increasing the steric hindrance between groups, it protects the main chain of the organosilicon composition, making it less prone to breakage under strong acid and alkali environments. However, due to its excessive increase in viscosity and steric effect, the silicone paste does not easily exhibit its defoaming characteristics, resulting in a slow defoaming speed, low application efficiency, and a complex preparation process. Patent CN105714580A uses polysiloxane and 3-methacryloyloxypropyltrimethoxysilane in its formulation and adds wollastonite to improve stability, but its high-temperature and alkali resistance performance has not been verified in the patent, and the unique needle-like structure of wollastonite can easily make the emulsion unstable, making the process difficult to control. Summary of the Invention

[0006] This invention addresses the aforementioned problems by innovatively providing a high-temperature, high-pressure resistant silicone defoamer and its preparation method. This silicone defoamer not only exhibits excellent stability in high-temperature, high-pressure systems but also maintains superior defoaming and foam-suppressing performance. Regarding the preparation process, the silicone defoamer features a simple reaction flow, mild process conditions, low operating requirements, and is easier to produce.

[0007] To achieve the above objectives, the specific solution adopted by the present invention is as follows:

[0008] In a first aspect, the present invention provides a high-temperature and high-pressure resistant silicone defoamer, which is prepared by weight percentage from the following components: 5%-55% polysiloxane silicone paste, 0.1%-10% spherical polysilsesquioxane, 0.3%-25% polyether-modified polysiloxane, 1%-25% emulsifier, 0.1%-5% thickener, 0.05%-0.3% bactericide, and the balance being water, wherein the sum of the weight percentages of each component is 100%.

[0009] Preferably, the preferred contents of each component in the high-temperature and high-pressure resistant silicone defoamer are as follows: by weight percentage, it is prepared from the following components: 8%-40% polysiloxane silicone paste, 0.5%-6% spherical polysilsesquioxane, 0.5%-20% polyether-modified polysiloxane, 1.5%-10% emulsifier, 0.1%-3% thickener, 0.05%-0.15% bactericide, with the balance being water, and the sum of the weight percentages of each component is 100%.

[0010] Furthermore, the preferred forms of each component in the above formulation are as follows:

[0011] (1) The structural formula of spherical polysilsesquioxane is shown below:

[0012]

[0013] Wherein, R is a reactive group or an inert group, wherein the inert group is selected from any one or more of methyl, cyclohexyl, cyclopentyl, isobutyl, and phenyl; and the reactive group is selected from any one or more of hydrogen, vinyl, hydroxyl, epoxy, and amino. Preferably, R is an inert group selected from methyl, hydroxyl, and phenyl.

[0014] Regarding particle size, the average particle size of spherical polysilsesquioxane is 0.1-50 micrometers, preferably 2-40 micrometers.

[0015] As a preferred embodiment, the spherical polysilsesquioxane in this invention can be obtained through commercial channels, such as those selected from Momentive TOSPEARL series and Elkem silicone MIRASIL MICROPEARL 40. Spherical polysilsesquioxanes exhibit excellent thermal and chemical stability, and their 3D structure protects the encapsulated silicone paste from precipitation in the emulsion, thus improving the stability of the defoamer.

[0016] (2) The polysiloxane silicone paste is selected from any one of Elken Silicones' Silcolapse 801, Silcolapse 910, and Silcolapse 825; Momentive Advanced Materials' Y-17164 or Y-14991; Dow Chemical's DOWSIL ACP-3056, DOWSIL ACP-3258, and DOWSIL ACP-3073; or other polysiloxane silicone pastes with the same properties. This type of silicone paste is a reactive cross-linking silicone paste with high viscosity, better defoaming and anti-foaming performance, and greater stability.

[0017] (3) The polyether-modified polysiloxane is selected from any one of Evonik Industries' TEGOPREN 5863, TEGOPREN 5803, and TEGOPREN 5801; any one of Momentive Materials' Silwet DA-33, Silwet DA-40, Silwet DA-63, Silwet SPM-1, Silwet SPM-2, and Silwet SPM-3; or other polyether-modified polysiloxanes with the same properties. These polyether-modified polysiloxanes have good dispersibility and more stable performance, which helps to improve the emulsification of silicone paste and also improves the defoaming performance of defoamers.

[0018] (4) The emulsifier is a nonionic surfactant, anionic surfactant, or a combination of both.

[0019] Nonionic surfactants are selected from fatty acid polyoxyethylene ethers, including lauric acid polyoxyethylene ether, oleic acid polyoxyethylene ether, palmitic acid polyoxyethylene ether, stearic acid polyoxyethylene ether; fatty alcohol polyoxyethylene ethers, including stearic acid polyether, glycerol polyether, etc.; glyceryl esters, including glycerol stearate, glycerol oleate; sorbitol derivatives, including sorbitan monostearate (Span-60), sorbitan monooleate (Span-80), sorbitan tristearate (Span-65), sorbitan trioleate (Span-85), polyoxyethylene sorbitan ether stearate (Tween-60), sorbitan monooleate polyoxyethylene ether (Tween-80), polyoxyethylene sorbitan tristearate (Tween-65), polyoxyethylene sorbitan trioleate (Tween-85); castor oil polyoxyethylene ether, etc.

[0020] Anionic surfactants are selected from sulfate salts, including sodium lauryl polyoxyethylene ether sulfate, 3-acylglycerol-1,2-disulfate salt, and sodium dodecyl sulfate; and sulfonates, including sodium potassium lauryl sulfonate, sodium ethylhexanol succinate sulfonate, sodium N,N-oleoylmethyl taurate, sodium butylnaphthalene sulfonate, sodium dodecylbenzene sulfonate, sodium dodecyl sulfonate, sodium hexadecyl sulfonate, sodium hexadecylbenzene sulfonate, and sodium dodecyl diphenyl ether disulfonate, etc.

[0021] In a preferred embodiment, the emulsifier can be obtained commercially. The nonionic surfactant is selected from different types of fatty alcohol polyoxyethylene ethers Brij72, Brij721, BrijL23, Brij58 and sorbitol derivatives Span 60, Tween 60, Tween 80; the anionic surfactant is commercially available sodium dodecyl sulfate and sodium dodecylbenzene sulfonate. The nonionic and anionic surfactants can be used alone or in combination.

[0022] (5) The thickener may be a cellulose-based thickener or a polyacrylate-based thickener, preferably any one of the polyacrylate-based thickeners. Polyacrylate-based thickeners have good alkali resistance, which can ensure that the defoamer is stable under highly alkaline conditions in textile applications.

[0023] (6) The bactericide can be chosen arbitrarily and obtained through commercial channels.

[0024] A second aspect of the present invention provides a method for preparing the above-mentioned high-temperature and high-pressure resistant silicone defoamer, comprising the following steps:

[0025] (1) Add the formulated amount of polysiloxane silicone paste, spherical polysilsesquioxane, polyether modified polysiloxane, emulsifier and thickener to the emulsification kettle, stir at 50℃-70℃ for 0.5-2h, mix evenly, and the stirring speed is 100-800rpm;

[0026] (2) Cool down to 15℃-40℃, slowly add water, and emulsify at high speed of 800rpm-2000rpm;

[0027] (3) Reduce the speed, add bactericide, and continue stirring at 50rpm-300rpm for 5-10 minutes to obtain the defoamer emulsion.

[0028] The technical effects of this invention are as follows:

[0029] In terms of effectiveness, the high-temperature and high-pressure defoamer provided by this invention improves the stability of emulsions under high-temperature and high-pressure environments through cross-linked polysiloxane silicone paste and spherical polysilsesquioxane with a specific structure. The cross-linked polysiloxane silicone paste provides superior defoaming and foam-suppressing performance, while the spherical polysilsesquioxane exhibits excellent thermal and chemical stability. Its 3D structure protects the encapsulated silicone paste from precipitation in the emulsion, thus improving the stability of the defoamer. Experimental results show that the defoamer of this invention, after being kept at 130°C and 2 atmospheres for 30 minutes, shows almost no precipitation after cooling, making it more suitable for application in the textile printing and dyeing industry.

[0030] In terms of preparation process, the method for preparing the high-temperature and high-pressure resistant defoamer provided by this invention has simple steps, mild reaction conditions, low requirements for process and equipment, high production efficiency, and is conducive to industrial-scale production. Detailed Implementation

[0031] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention. These all fall within the scope of protection of the present invention.

[0032] Example 1

[0033] A high-temperature and high-pressure resistant defoamer for textile applications is prepared according to the following steps: 8% Silcolapse 910, 0.5% TOSPEARL 145, 0.5% TEGOPREN 5863, 1% Brij72, 0.45% Brij721, 0.05% sodium dodecyl sulfate, and 3% thickener are added to an emulsification tank and stirred at 50°C for 2 hours at a stirring speed of 100 rpm; the temperature is lowered to 20°C, and the remaining water is slowly added, followed by high-speed mechanical emulsification at 800 rpm; the stirring speed is reduced to 100 rpm, 1.5% bactericide is added, and stirring continues for 5 minutes to obtain a high-temperature and high-pressure resistant defoamer emulsion for textile applications.

[0034] Example 2

[0035] A high-temperature and high-pressure resistant defoamer for textile applications is prepared according to the following steps: 12% Silcolapse 801, 1% TOSPEARL 120, 2% TEGOPREN 5803, 1.5% Span 60, 3.5% Tween 60, and 2.5% thickener are added to an emulsification tank and stirred at 60°C for 1 hour at a stirring speed of 500 rpm; the temperature is lowered to 30°C, and the remaining water is slowly added, followed by high-speed mechanical emulsification at 1000 rpm; the stirring speed is reduced to 200 rpm, 1% bactericide is added, and stirring continues for 8 minutes to obtain a high-temperature and high-pressure resistant defoamer emulsion for textile applications.

[0036] Example 3

[0037] A high-temperature and high-pressure resistant defoamer for textile applications is prepared according to the following steps: 18% Silcolapse 825, 4% TOSPEARL 130, 3% DA-63, 1% Brij 72, 3% Brij L23, 0.1% sodium dodecylbenzenesulfonate, and 2% thickener are added to an emulsification tank and stirred at 65°C for 1.5 hours at a stirring speed of 200 rpm; the temperature is lowered to 35°C, and the remaining water is slowly added, followed by high-speed mechanical emulsification at 1200 rpm; the stirring speed is reduced to 150 rpm, and 0.8% bactericide is added, and stirring continues for 6 minutes to obtain a high-temperature and high-pressure resistant defoamer emulsion for textile applications.

[0038] Example 4

[0039] A high-temperature and high-pressure resistant defoamer for textile applications is prepared according to the following steps: 25% DOWSILACP-3258, 6% TOSPEARL240, 5% DA-40, 3.5% Span 60, 6.4% Tween 60, and 1% thickener are added to an emulsification tank and stirred at 65°C for 1 hour at a stirring speed of 600 rpm; the temperature is lowered to 40°C, and the remaining water is slowly added, followed by high-speed mechanical emulsification at 1500 rpm; the stirring speed is reduced to 200 rpm, and 0.5% bactericide is added, and stirring continues for 5 minutes to obtain a high-temperature and high-pressure resistant defoamer emulsion for textile applications.

[0040] Example 5

[0041] A high-temperature and high-pressure resistant defoamer for textile applications is prepared according to the following steps: 30% DOWSILACP-3056, 3% TOSPEARL3120, 10% SPM-2, 1.5% Span 60, 4% Tween 80, and 0.5% thickener are added to an emulsification tank and stirred at 70°C for 0.5 hours at a stirring speed of 800 rpm; the temperature is lowered to 20°C, and the remaining water is slowly added, followed by high-speed mechanical emulsification at 2000 rpm; the stirring speed is reduced to 100 rpm, and 0.5% bactericide is added, and stirring continues for 10 minutes to obtain a high-temperature and high-pressure resistant defoamer emulsion for textile applications.

[0042] Example 6

[0043] A high-temperature and high-pressure resistant defoamer for textile applications is prepared according to the following steps: 32% DOWSILACP-3073, 2.5% MICROPEAL 40, 12% SPM-3, 1% Span 60, 2% Brij L23, and 0.4% thickener are added to an emulsification tank and stirred at 70°C for 0.5 hours at a stirring speed of 800 rpm; the temperature is lowered to 20°C, and the remaining water is slowly added, followed by high-speed mechanical emulsification at 2000 rpm; the stirring speed is reduced to 100 rpm, and 0.6% bactericide is added, and stirring is continued for 10 minutes to obtain a high-temperature and high-pressure resistant defoamer emulsion for textile applications.

[0044] Example 7

[0045] A high-temperature and high-pressure resistant defoamer for textile applications is prepared according to the following steps: 35% Y-17164, 1% MICROPEAL 40, 15% SPM-1, 3% Brij L58, and 0.3% thickener are added to an emulsification tank and stirred at 70°C for 0.5 hours at a stirring speed of 800 rpm; the temperature is lowered to 20°C, and the remaining water is slowly added, followed by high-speed mechanical emulsification at 1200 rpm; the speed is reduced to 200 rpm, and 0.1% bactericide is added, and stirring is continued for 10 minutes to obtain a high-temperature and high-pressure resistant defoamer emulsion for textile applications.

[0046] Example 8

[0047] A high-temperature and high-pressure resistant defoamer for textile applications is prepared according to the following steps: 40% Y-14991, 1.5% TOSPEARL145, 20% DA-33, 1.3% Span 60, 2% Tween 60, 0.05% sodium dodecyl sulfate, and 0.1% thickener are added to an emulsification tank and stirred at 60°C for 1 hour at a stirring speed of 600 rpm; the temperature is lowered to 20°C, and the remaining water is slowly added, followed by high-speed mechanical emulsification at 1200 rpm; the stirring speed is reduced to 300 rpm, and 0.05% bactericide is added, and stirring continues for 10 minutes to obtain a high-temperature and high-pressure resistant defoamer emulsion for textile applications.

[0048] Comparative Example 1

[0049] The preparation method of the silicone defoamer in Comparative Example 1 is basically the same as that in Example 1, except that the formulation does not contain polysilsesquioxane TOSPEARL 145.

[0050] Comparative Example 2

[0051] The preparation method of the silicone defoamer in Comparative Example 2 is basically the same as that in Example 1. The difference is that the silicone paste used in the formula is a self-made silicone paste, which is prepared according to known technology, namely, polydimethylsiloxane and precipitated silica are blended at high temperature.

[0052] The formulation information for Examples 1-8 and Comparative Examples 1-2 is summarized in Table 1:

[0053] Table 1 Formulation information for Examples 1-8 and Comparative Examples 1-2

[0054]

[0055] Effect Comparison

[0056] The following performance tests were performed on the above embodiments and comparative examples:

[0057] 1. High temperature and high pressure stability test

[0058] The testing method is as follows:

[0059] (1) Dilute the prepared defoamer to a solid content of 5% for later use;

[0060] (2) Take a 250ml beaker, add 5g of diluted defoamer and 195g of tap water;

[0061] (3) Place the beaker containing the test sample into an autoclave, set the temperature to 130℃ and the pressure to 2 atmospheres, heat to 130℃ and keep warm for 30 minutes. After cooling, take it out and observe the appearance and the precipitation state of the defoamer. The more severe the precipitation, the worse the stability.

[0062] Table 2 shows the high-temperature and high-pressure stability test results of Examples 1-8 and Comparative Examples 1-2. More positive signs indicate more severe precipitation, while fewer positive signs indicate a more stable defoamer and better high-temperature and high-pressure resistance. Compared to Comparative Example 1, the defoamers in each example and Comparative Example 2 showed less precipitation and more stable emulsions, indicating that the special 3D structure of the spherical polysilsesquioxane effectively protects the stability of the defoamer. Because it does not rupture and precipitate under high temperature and pressure, it can function stably even in acidic and alkaline environments. Comparative Example 1, lacking spherical polysilsesquioxane, experienced severe precipitation and particularly poor high-temperature and high-pressure resistance, hindering its application in the textile printing and dyeing industry.

[0063] Table 2 Comparison of precipitation effects between the examples and comparative examples

[0064]

[0065] 2. Foam suppression and defoaming performance test

[0066] The testing method is as follows:

[0067] (1) Add 5g of sodium dodecylbenzenesulfonate, 5g of TX-100 and 2g of sodium hydroxide to 1000ml of tap water to prepare a foaming solution for later use.

[0068] (2) Dilute the prepared defoamer to a solid content of 5% for later use;

[0069] (3) Take 50g of the prepared foaming liquid and put it into a 100ml transparent PP bottle. Accurately weigh and add 0.1g of diluted defoamer, tighten the cap, and preheat in a 60℃ water bath for 15 minutes.

[0070] (4) Place the small bottle on a vertical shaker and shake it up and down for 1 minute at a frequency of 400 rpm. After stopping, immediately start the stopwatch to record the time when the foam disappears. Repeat the shaking test multiple times.

[0071] Table 3 shows the defoaming and foam suppression test results of Examples 1-8 and Comparative Examples 1-2. Shorter times indicate better defoaming effects. With an increase in the number of tests, the defoaming time did not significantly increase, indicating better durability and foam suppression performance of the defoamer. The results show that Examples 1-8 have better defoaming and foam suppression performance and are more stable and resistant to degradation. Comparative Example 1, lacking the protection of spherical polysilsesquioxane, experienced a gradual decrease in stability, leading to performance degradation. Comparative Example 2 indicates that the non-reactive silicone paste defoams too slowly, resulting in low efficiency in practical use. In real-world applications, it may be unable to suppress foam in the dye vat after pressure relief.

[0072] Table 3 Comparison of defoaming and foam-inhibiting effects between the examples and comparative examples

[0073]

[0074] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A high-temperature and high-pressure resistant silicone defoamer, characterized in that, The product is prepared by weight percentage from the following components: 5%-55% polysiloxane silicone paste, 0.1%-10% spherical polysilsesquioxane, 0.3%-25% polyether-modified polysiloxane, 1%-25% emulsifier, 0.1%-5% thickener, 0.05%-0.3% bactericide, and the balance being water. The sum of the weight percentages of all components is 100%. The structural formula of the spherical polysilsesquioxane is shown below: Wherein, R is a reactive group or an inert group, wherein the inert group is selected from any one or more of methyl, cyclohexyl, cyclopentyl, isobutyl, and phenyl; and the reactive group is selected from any one or more of hydrogen, vinyl, hydroxyl, epoxy, and amino.

2. The high-temperature and high-pressure resistant organosilicon defoamer according to claim 1, characterized in that, The product is prepared by weight percentage from the following components: 8%-40% polysiloxane silicone paste, 0.5%-6% spherical polysilsesquioxane, 0.5%-20% polyether-modified polysiloxane, 1.5%-10% emulsifier, 0.1%-3% thickener, 0.05%-0.15% bactericide, and the balance being water, with the sum of the weight percentages of all components being 100%.

3. The high-temperature and high-pressure resistant silicone defoamer according to claim 1 or 2, characterized in that: in, The average particle size of the spherical polysilsesquioxane is 0.1-50 micrometers.

4. The high-temperature and high-pressure resistant silicone defoamer according to claim 3, characterized in that: in, The average particle size of the spherical polysilsesquioxane is 2-40 micrometers; when R is an inert group, it is selected from methyl or phenyl; when R is a reactive group, it is selected from hydroxyl.

5. The high-temperature and high-pressure resistant silicone defoamer according to claim 3, characterized in that: in, The polysiloxane silicone paste is selected from any one of Elkem Silicones' Silcolapse 801, Silcolapse 910, and Silcolapse 825; Momentive Advanced Materials' Y-17164 or Y-14991; and Dow Chemical's DOWSIL ACP-3056, DOWSIL ACP-3258, and DOWSIL ACP-3073. The polyether-modified polysiloxane is selected from any one of Evonik Industries' TEGOPREN 5863, TEGOPREN 5803 and TEGOPREN 5801; and any one of Momentive Materials' Silwet DA-33, Silwet DA-40, Silwet DA-63, Silwet SPM-1, Silwet SPM-2 and Silwet SPM-3.

6. The high-temperature and high-pressure resistant organosilicon defoamer according to claim 1, characterized in that: in, The emulsifier is selected from one or more of nonionic surfactants and anionic surfactants; The nonionic surfactant is selected from any one of fatty acid polyoxyethylene ether, fatty alcohol polyoxyethylene ether, sorbitol, and castor oil polyoxyethylene ether; The anionic surfactant is selected from any one of sodium lauryl polyoxyethylene ether sulfate, 3-acylglycerol-1,2-disulfate salt, sodium dodecyl sulfate, sodium potassium lauryl sulfonate, sodium ethylhexanol succinate sulfonate, sodium N,N-oleoylmethyl taurate, sodium butylnaphthalene sulfonate, sodium dodecylbenzene sulfonate, sodium dodecyl sulfonate, sodium hexadecyl sulfonate, sodium hexadecylbenzene sulfonate, and sodium dodecyl diphenyl ether disulfonate.

7. The high-temperature and high-pressure resistant silicone defoamer according to claim 1, characterized in that: in, The thickener is selected from any of the polyacrylate thickeners.

8. The preparation method of the high-temperature and high-pressure resistant organosilicon defoamer according to claim 1 or 2, characterized in that, Includes the following steps: (1) Add the formulated amount of polysiloxane silicone paste, spherical polysilsesquioxane, polyether modified polysiloxane, emulsifier and thickener to the emulsification kettle, stir at 50℃-70℃ for 0.5-2h, mix evenly, and the stirring speed is 100-800rpm; (2) Cool down to 15℃-40℃, slowly add water, and emulsify at high speed of 800rpm-2000rpm; (3) Reduce the speed, add bactericide, and continue stirring at 50rpm-300rpm for 5-10 minutes to obtain the defoamer emulsion.

Images