A method for preparing a silicone-modified polyether ester defoamer

Abstract

The present application relates to the technical field of chemical engineering, and particularly relates to a preparation method of an organic silicon modified polyether ester defoaming agent, which comprises low hydrogen-containing silicone oil, allyl silicone oil, polyether modified siloxane, lauric acid, p-toluene sulfonic acid catalyst, polyoxyethylene polyoxypropylene ether, heptamethyltrisiloxane and Tween 80, and an appropriate amount of chloroplatinic acid catalyst. The preparation process is divided into three steps: firstly, the polyether modified siloxane and the lauric acid are subjected to esterification reaction under the action of the TSA catalyst to obtain a colorless transparent viscous liquid; secondly, the low hydrogen-containing silicone oil, the allyl silicone oil and the polyoxyethylene polyoxypropylene ether are subjected to hydrosilylation reaction with the heptamethyltrisiloxane under the catalysis of the chloroplatinic acid to generate a polyether modified siloxane compound; finally, the two kinds of products and the Tween 80 are mixed and stirred at low temperature to obtain the final organic silicon modified polyether ester defoaming agent. The defoaming agent prepared by the method has excellent defoaming performance and stability, and is suitable for various industrial fields.

Description

Technical Field

[0001] This invention relates to the field of chemical engineering technology, specifically a method for preparing an organosilicon-modified polyether ester defoamer. This defoamer is particularly suitable for foam control in various industrial processes and has the characteristics of high efficiency, long-lasting effect, and environmental friendliness. Background Technology

[0002] In various industries such as chemical, textile, papermaking, coating, and food processing, foam generation often affects production efficiency and product quality. While traditional defoamers can suppress foam to some extent, they often suffer from unstable effects, residue buildup, and negative impacts on product performance. Therefore, developing new, efficient, and environmentally friendly defoamers is of great significance.

[0003] Traditional defoamers, such as mineral oil-based, silicone-based, and polyether-based defoamers, while effective at suppressing foam to some extent, often have limitations. For example, mineral oil-based defoamers may affect product transparency or leave oil stains; silicone-based defoamers, although highly efficient, may have compatibility issues in certain systems; and polyether-based defoamers may fail at excessively high temperatures. Therefore, there is a need to develop novel defoamers to overcome these limitations.

[0004] Silicone-modified polyether ester defoamers combine the advantages of both silicone and polyether esters. The silicone component imparts excellent defoaming properties and low surface tension, while the polyether ester enhances its compatibility and stability in different systems. This composite defoamer better meets the defoaming requirements under complex process conditions. Summary of the Invention

[0005] The purpose of this invention is to provide a method for preparing an organosilicon-modified polyether ester defoamer, which achieves a combination of high-efficiency defoaming and good compatibility through specific raw material ratios and process steps.

[0006] The technical solution of the present invention is as follows:

[0007] A method for preparing an organosilicon-modified polyether ester defoamer, characterized in that the mass formula of its raw materials is as follows:

[0008] 30-40 parts of low-hydrogen silicone oil

[0009] 20-25 parts allyl silicone oil

[0010] 12-15 parts of polyether-modified siloxane

[0011] 4-8 parts lauric acid

[0012] 3-5 parts of p-toluenesulfonic acid (TSA) catalyst

[0013] 8-12 parts of polyoxyethylene polyoxypropylene ether

[0014] 10-15 parts of heptamethyltrisiloxane

[0015] Tween 80 1-2 servings

[0016] Appropriate amount of chloroplatinic acid catalyst

[0017] Its special method includes the following steps:

[0018] S1: Mix polyether-modified siloxane and lauric acid, add p-toluenesulfonic acid (TSA) catalyst, heat to 130℃-140℃, stir and react for 3-4 hours, and use a vacuum machine to remove the generated water vapor to obtain a colorless, transparent, viscous liquid.

[0019] S2: Mix low-hydrogen silicone oil, allyl silicone oil, and polyoxyethylene polyoxypropylene ether, heat to 60-70℃, add chloroplatinic acid catalyst, then add heptamethyltrisiloxane, heat to 110℃-130℃, and stir for 1-2 hours to obtain a polyether-modified siloxane composite; through a hydrogenation silanization reaction, low-hydrogen silicone oil, allyl silicone oil, and polyoxyethylene polyoxypropylene ether react with heptamethyltrisiloxane under the action of chloroplatinic acid catalyst to generate a polyether-modified siloxane composite.

[0020] S3: Mix colorless, transparent, viscous liquid, polyether-modified siloxane complex, and Tween 80 at 30-40℃, stir for 1-2 hours, and then cool to obtain the final product.

[0021] The method for preparing an organosilicon-modified polyether ester defoamer is characterized in that the mass formula of its raw materials is as follows:

[0022] 30 parts of low-hydrogen silicone oil

[0023] 20 parts allyl silicone oil

[0024] 12 parts of polyether-modified siloxane

[0025] 4 parts lauric acid

[0026] 3 parts of p-toluenesulfonic acid (TSA) catalyst

[0027] 8 parts of polyoxyethylene polyoxypropylene ether

[0028] 10 parts of heptamethyltrisiloxane

[0029] Tween 80 1 serving

[0030] Appropriate amount of chloroplatinic acid catalyst.

[0031] The method for preparing an organosilicon-modified polyether ester defoamer is characterized in that the mass formula of its raw materials is as follows:

[0032] 40 parts of low-hydrogen silicone oil

[0033] 25 parts allyl silicone oil

[0034] 15 parts of polyether-modified siloxane

[0035] 8 parts lauric acid

[0036] 5 parts of p-toluenesulfonic acid (TSA) catalyst

[0037] 12 parts of polyoxyethylene polyoxypropylene ether

[0038] 15 parts of heptamethyltrisiloxane

[0039] Tween 80 2 copies

[0040] Appropriate amount of chloroplatinic acid catalyst.

[0041] The method for preparing an organosilicon-modified polyether ester defoamer is characterized in that the mass formula of its raw materials is as follows:

[0042] 35 parts of low-hydrogen silicone oil

[0043] 22 parts allyl silicone oil

[0044] 14 parts of polyether-modified siloxane

[0045] 6 parts lauric acid

[0046] 4 parts of p-toluenesulfonic acid (TSA) catalyst

[0047] 10 parts of polyoxyethylene polyoxypropylene ether

[0048] 12 parts of heptamethyltrisiloxane

[0049] Tween 80 2 copies

[0050] Appropriate amount of chloroplatinic acid catalyst.

[0051] The method for preparing an organosilicon-modified polyether ester defoamer is characterized by comprising the following steps:

[0052] S1: Mix polyether-modified siloxane and lauric acid, add p-toluenesulfonic acid (TSA) catalyst, heat to 135°C, stir for 4 hours, and use a vacuum machine to remove the generated water vapor to obtain a colorless, transparent, viscous liquid.

[0053] S2: Mix low-hydrogen silicone oil, allyl silicone oil, and polyoxyethylene polyoxypropylene ether, heat to 60°C, add chloroplatinic acid catalyst, then add heptamethyltrisiloxane, heat to 130°C, and stir for 2 hours to obtain polyether-modified siloxane composite.

[0054] S3: Mix colorless, transparent, viscous liquid, polyether-modified siloxane complex, and Tween 80 at 40°C, stir for 2 hours, and then cool to obtain the final product.

[0055] Polyether-modified siloxanes combine the hydrophilicity of polyethers with the hydrophobicity of siloxanes. This amphiphilicity allows polyether-modified siloxanes to rapidly diffuse onto the foam surface and reduce the surface tension of the foam, thereby compromising its stability.

[0056] Esterification products of lauric acid and polyether-modified siloxane: Through the esterification reaction in step S1, lauric acid combines with polyether-modified siloxane to form an ester compound with a longer carbon chain and stronger hydrophobicity. This compound further enhances the surface activity and foam-breaking ability of the defoamer.

[0057] Hydrogen-silanized products of low-hydrogen silicone oil and allyl silicone oil: In step S2, low-hydrogen silicone oil, allyl silicone oil, and polyoxyethylene polyoxypropylene ether undergo a hydrogenation-silanization reaction with heptamethyltrisiloxane under the catalysis of chloroplatinic acid, generating a complex siloxane complex. This complex exhibits excellent lubricity and film-forming properties, enabling it to form a stable film on the foam surface, further inhibiting foam formation and diffusion.

[0058] Tween 80: As a nonionic surfactant, Tween 80 plays a role in emulsification, dispersion, and stabilization in defoamers. It helps to ensure uniform dispersion of the components in water, improving the stability and effectiveness of the defoamer.

[0059] Advantages of this invention:

[0060] 1. Highly efficient defoaming performance: By esterifying polyether-modified siloxane with lauric acid, a colorless, transparent, viscous liquid is generated, exhibiting excellent surface activity and foam-breaking ability. This esterification product can rapidly diffuse to the foam surface, reducing surface tension and thus effectively disrupting foam stability.

[0061] The polyether-modified siloxane composite is prepared by a hydrosilylation reaction, which allows it to form a stable film on the foam surface, further inhibiting the formation and diffusion of foam.

[0062] 2. Good stability: As a nonionic surfactant, Tween 80 plays a role in emulsification, dispersion, and stabilization during the preparation process. It helps the components to disperse evenly in water, improving the stability and effectiveness of the defoamer.

[0063] Because this defoamer combines the advantages of organosilicon and polyether, it has excellent temperature resistance, acid and alkali resistance, and shear resistance, making it suitable for various industrial fields such as chemical, textile, printing and dyeing, papermaking, and coating. Detailed Implementation

[0064] A method for preparing an organosilicon-modified polyether ester defoamer, comprising weighing the following raw materials:

[0065] 350g of low-hydrogen silicone oil

[0066] 200g allyl silicone oil

[0067] 120g of polyether-modified siloxane

[0068] 40g of lauric acid

[0069] 30 grams of p-toluenesulfonic acid (TSA) catalyst

[0070] 100g of polyoxyethylene polyoxypropylene ether

[0071] 120 grams of heptamethyltrisiloxane

[0072] Tween 80 20g

[0073] Appropriate amount of chloroplatinic acid catalyst

[0074] Its special method includes the following steps:

[0075] S1: Mix polyether-modified siloxane and lauric acid, add p-toluenesulfonic acid (TSA) catalyst, heat to 130℃-140℃, stir and react for 3-4 hours, and use a vacuum machine to remove the generated water vapor to obtain a colorless, transparent, viscous liquid.

[0076] S2: Mix low-hydrogen silicone oil, allyl silicone oil, and polyoxyethylene polyoxypropylene ether, heat to 60-70℃, add chloroplatinic acid catalyst, then add heptamethyltrisiloxane, heat to 110℃-130℃, and stir for 1-2 hours to obtain polyether modified siloxane composite.

[0077] S3: Mix colorless, transparent, viscous liquid, polyether-modified siloxane complex, and Tween 80 at 30-40℃, stir for 1-2 hours, and then cool to obtain the final product.

[0078] The polyether-modified siloxane and its esterification products in the defoamer of this invention can rapidly diffuse to the foam surface and significantly reduce the surface tension of the foam. This reduction in surface tension disrupts the stability of the foam, making it prone to breakage. The hydrogenated silanized products form a stable film on the foam surface, which prevents further foam formation and diffusion. Simultaneously, the lubricity of the film also aids in foam breakage and dissipation. The emulsifying and dispersing effects of Tween 80 ensure that the components in the defoamer are uniformly dispersed in the medium, improving the efficiency and stability of the defoamer. This invention achieves effective suppression and elimination of foam through a combination of effects, including reducing foam surface tension, forming a stable film, and emulsification and dispersion.

[0079] Tests on samples prepared in this invention:

[0080] The defoaming agent A prepared by the method described in this article was compared with the existing polyether ester defoamer B in the surfactant field.

[0081] Surfactant foaming solution: 0.05% sodium dodecylbenzenesulfonate, 0.5% aqueous solution of OP-10

[0082] Take 50 ml of foaming liquid and add 0.02 g of defoamer sample to each sample. Place them in a shaker and shake for 5 min, recording the temperature as 28℃. Record the foam height and the time it takes for the foam to completely disappear after shaking stops.

[0083] .

Claims

1. A method for preparing an organosilicon-modified polyether ester defoamer, characterized in that, The quality formula of its raw materials is as follows: 30-40 parts of low-hydrogen silicone oil 20-25 parts allyl silicone oil 12-15 parts of polyether-modified siloxane 4-8 parts lauric acid 3-5 parts of p-toluenesulfonic acid (TSA) catalyst 8-12 parts of polyoxyethylene polyoxypropylene ether 10-15 parts of heptamethyltrisiloxane Tween 80 1-2 servings Appropriate amount of chloroplatinic acid catalyst Its special method includes the following steps: S1: Mix polyether-modified siloxane and lauric acid, add p-toluenesulfonic acid (TSA) catalyst, heat to 130℃-140℃, stir and react for 3-4 hours, and use a vacuum machine to remove the generated water vapor to obtain a colorless, transparent, viscous liquid. S2: Mix low-hydrogen silicone oil, allyl silicone oil, and polyoxyethylene polyoxypropylene ether, heat to 60-70℃, add chloroplatinic acid catalyst, then add heptamethyltrisiloxane, heat to 110℃-130℃, and stir for 1-2 hours to obtain polyether modified siloxane composite. S3: Mix colorless, transparent, viscous liquid, polyether-modified siloxane complex, and Tween 80 at 30-40℃, stir for 1-2 hours, and then cool to obtain the final product.

2. The preparation method of the organosilicon-modified polyether ester defoamer according to claim 1, characterized in that, The quality formula of its raw materials is as follows: 30 parts of low-hydrogen silicone oil 20 parts allyl silicone oil 12 parts of polyether-modified siloxane 4 parts lauric acid 3 parts of p-toluenesulfonic acid (TSA) catalyst 8 parts of polyoxyethylene polyoxypropylene ether 10 parts of heptamethyltrisiloxane Tween 80 1 serving Appropriate amount of chloroplatinic acid catalyst.

3. The method for preparing an organosilicon-modified polyether ester defoamer according to claim 1, characterized in that, The quality formula of its raw materials is as follows: 40 parts of low-hydrogen silicone oil 25 parts allyl silicone oil 15 parts of polyether-modified siloxane 8 parts lauric acid 5 parts of p-toluenesulfonic acid (TSA) catalyst 12 parts of polyoxyethylene polyoxypropylene ether 15 parts of heptamethyltrisiloxane Tween 80 2 copies Appropriate amount of chloroplatinic acid catalyst.

4. The preparation method of the organosilicon-modified polyether ester defoamer according to claim 1, characterized in that, The quality formula of its raw materials is as follows: 35 parts of low-hydrogen silicone oil 22 parts allyl silicone oil 14 parts of polyether-modified siloxane 6 parts lauric acid 4 parts of p-toluenesulfonic acid (TSA) catalyst 10 parts of polyoxyethylene polyoxypropylene ether 12 parts of heptamethyltrisiloxane Tween 80 2 copies Appropriate amount of chloroplatinic acid catalyst.

5. The method for preparing an organosilicon-modified polyether ester defoamer according to claim 1, characterized in that, Its special method includes the following steps: S1: Mix polyether-modified siloxane and lauric acid, add p-toluenesulfonic acid (TSA) catalyst, heat to 135°C, stir for 4 hours, and use a vacuum machine to remove the generated water vapor to obtain a colorless, transparent, viscous liquid. S2: Mix low-hydrogen silicone oil, allyl silicone oil, and polyoxyethylene polyoxypropylene ether, heat to 60°C, add chloroplatinic acid catalyst, then add heptamethyltrisiloxane, heat to 130°C, and stir for 2 hours to obtain polyether-modified siloxane composite. S3: Mix colorless, transparent, viscous liquid, polyether-modified siloxane complex, and Tween 80 at 40°C, stir for 2 hours, and then cool to obtain the final product.