Preparation method of organic silicon modified polyether ester defoaming agent

Abstract

The invention relates to the technical field of chemistry and chemical engineering, in particular to a preparation method of an organic silicon modified polyether ester defoaming agent which comprises low-hydrogen-content silicone oil, allyl silicone oil, polyether modified siloxane, lauric acid, a p-toluenesulfonic acid catalyst, polyoxyethylene polyoxypropylene ether, heptamethyltrisiloxane, Tween 80 and a proper amount of chloroplatinic acid catalyst. The preparation method comprises the following three steps: firstly, carrying out esterification reaction on polyether modified siloxane and lauric acid under the action of a TSA catalyst to obtain colorless transparent viscous liquid; secondly, low-hydrogen-content silicone oil, allyl silicone oil, polyoxyethylene polyoxypropylene ether and heptamethyltrisiloxane are subjected to a hydrosilylation reaction under the catalysis of chloroplatinic acid, and a polyether modified siloxane compound is generated; and finally, mixing and stirring the two products and Tween 80 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] The invention relates to the technical field of chemistry and chemical engineering, and in particular to a method for preparing an organosilicon-modified polyether ester defoamer. The defoamer is particularly suitable for foam control in various industrial processes and has the characteristics of high efficiency, durability and environmental protection. Background Art

[0002] In many industries such as chemical, textile, paper, coating and food processing, the generation of foam often affects production efficiency and product quality. Although traditional defoamers can suppress foam to a certain extent, they often have problems such as unstable effect, easy residue and affect product performance. Therefore, it is of great significance to develop new, efficient and environmentally friendly defoamers.

[0003] Traditional defoamers such as mineral oils, silicones, and polyethers can suppress foam to a certain extent, but they often have certain limitations. For example, mineral oil defoamers may affect the transparency of the product or leave oil spots; although silicone defoamers are highly efficient, they may have compatibility issues in certain systems; and polyether defoamers may become ineffective due to excessively high temperatures. Therefore, it is necessary to develop new defoamers to overcome these limitations.

[0004] Silicone-modified polyetherester defoamer combines the advantages of silicone and polyetherester. The silicone component gives it excellent defoaming performance and low surface tension, while the polyetherester improves its compatibility and stability in different systems. This composite defoamer can better meet the defoaming needs under complex process conditions. Summary of the invention

[0005] The object of the present invention is to provide a method for preparing an organosilicon-modified polyetherester 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: A method for preparing a silicone-modified polyetherester defoamer, characterized in that the mass formula of the raw materials is: 30-40 parts of low hydrogen silicone oil Allyl silicone oil 20-25 parts Polyether modified siloxane 12-15 parts 4-8 parts of lauric acid 3-5 parts of p-toluenesulfonic acid (TSA) catalyst 8-12 parts of polyoxyethylene polyoxypropylene ether Heptamethyltrisiloxane 10-15 parts Tween 80 1-2 servings Chloroplatinic acid catalyst The special method comprises the following steps: S1: Mix polyether-modified siloxane and lauric acid, add p-toluenesulfonic acid (TSA) catalyst, heat to 130-140°C, stir and react for 3-4 hours, and use a vacuum machine to extract 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°C, add chloroplatinic acid catalyst, then add heptamethyltrisiloxane, heat to 110°C-130°C, and stir to react for 1-2 hours to obtain a polyether modified siloxane complex; through a hydrosilylation 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 complex.

[0007] S3: Mix the colorless transparent viscous liquid, the polyether-modified siloxane compound and Tween 80 at 30-40° C., stir for 1-2 hours, and cool to obtain the product.

[0008] The method for preparing a silicone-modified polyetherester defoamer is characterized in that the mass formula of the raw materials is: 30 parts of low hydrogen silicone oil Allyl silicone oil 20 parts 12 parts of polyether modified siloxane 4 parts of lauric acid 3 parts of p-toluenesulfonic acid (TSA) catalyst 8 parts of polyoxyethylene polyoxypropylene ether 10 parts of heptamethyl trisiloxane Tween 80 1 serving Chloroplatinic acid catalyst is used in appropriate amount.

[0009] The method for preparing a silicone-modified polyetherester defoamer is characterized in that the mass formula of the raw materials is: 40 parts of low hydrogen silicone oil Allyl silicone oil 25 parts 15 parts of polyether modified siloxane 8 parts of lauric acid 5 parts of p-toluenesulfonic acid (TSA) catalyst 12 parts of polyoxyethylene polyoxypropylene ether 15 parts of heptamethyl trisiloxane Tween 80 2 servings Chloroplatinic acid catalyst is used in appropriate amount.

[0010] The method for preparing a silicone-modified polyetherester defoamer is characterized in that the mass formula of the raw materials is: 35 parts of low hydrogen silicone oil Allyl silicone oil 22 parts 14 parts of polyether modified siloxane 6 parts of lauric acid 4 parts of p-toluenesulfonic acid (TSA) catalyst 10 parts of polyoxyethylene polyoxypropylene ether 12 parts of heptamethyl trisiloxane Tween 80 2 servings Chloroplatinic acid catalyst is used in appropriate amount.

[0011] The method for preparing the organosilicon-modified polyether ester defoamer is characterized in that the method comprises the following steps: S1: Mix polyether-modified siloxane and lauric acid, add p-toluenesulfonic acid (TSA) catalyst, heat to 135°C, stir and react for 4 hours, and use a vacuum machine to extract 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 heptamethyl trisiloxane, heat to 130°C, stir and react for 2 hours to obtain a polyether modified siloxane composite; S3: Mix the colorless transparent viscous liquid, the polyether-modified siloxane compound and Tween 80, mix at 40° C., stir for 2 hours, and cool to obtain the product.

[0012] Polyether modified siloxane: It combines the hydrophilicity of polyether and the hydrophobicity of siloxane. This amphiphilicity enables polyether modified siloxane to quickly diffuse to the foam surface and reduce the surface tension of the foam, thereby destroying the stability of the foam.

[0013] Esterification product of lauric acid and polyether-modified siloxane: Through the esterification reaction in step S1, lauric acid is combined 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 destruction ability of the defoamer.

[0014] Hydrosilylation product of low hydrogen silicone oil and allyl silicone oil: In step S2, low hydrogen silicone oil, allyl silicone oil, polyoxyethylene polyoxypropylene ether, under the action of chloroplatinic acid catalyst, undergo hydrosilylation reaction with heptamethyltrisiloxane to generate a complex siloxane compound. This compound has excellent lubricity and film-forming properties, and can form a stable film on the foam surface, further inhibiting the generation and diffusion of foam.

[0015] Tween 80: As a nonionic surfactant, Tween 80 plays the role of emulsification, dispersion and stabilization in defoamers. It helps to evenly disperse the components in water, improving the stability and use effect of the defoamer.

[0016] Advantages of the present invention: 1. Highly effective defoaming performance: By esterifying polyether-modified siloxane with lauric acid, the colorless, transparent, viscous liquid produced has excellent surface activity and foam-destroying ability. This esterification product can quickly diffuse to the foam surface, reduce surface tension, and effectively destroy the stability of the foam.

[0017] The polyether-modified siloxane compound is prepared by a hydrosilylation reaction, which enables it to form a stable film on the foam surface, further inhibiting the generation and diffusion of foam.

[0018] 2. Good stability: As a non-ionic surfactant, Tween 80 plays the role of emulsification, dispersion and stabilization in the preparation process. It helps to evenly disperse the components in water and improves the stability and use effect of the defoamer.

[0019] Since this defoamer combines the advantages of silicone and polyether, it has excellent temperature resistance, acid and alkali resistance and shear resistance, so it is suitable for a variety of industrial fields, such as chemical industry, textile, printing and dyeing, papermaking, coatings, etc. DETAILED DESCRIPTION

[0020] A method for preparing a silicone-modified polyetherester defoamer comprises weighing the following raw materials: 350g low hydrogen silicone oil Allyl silicone oil 200g Polyether modified siloxane 120g Lauric acid 40 g p-Toluenesulfonic acid (TSA) catalyst 30g Polyoxyethylene polyoxypropylene ether 100g Heptamethyl trisiloxane 120g Tween 80 20g Chloroplatinic acid catalyst The special method comprises the following steps: S1: Mix polyether-modified siloxane and lauric acid, add p-toluenesulfonic acid (TSA) catalyst, heat to 130-140°C, stir and react for 3-4 hours, and use a vacuum machine to extract 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°C, add chloroplatinic acid catalyst, then add heptamethyltrisiloxane, heat to 110-130°C, stir and react for 1-2 hours to obtain a polyether modified siloxane complex; S3: Mix the colorless transparent viscous liquid, the polyether-modified siloxane compound and Tween 80 at 30-40° C., stir for 1-2 hours, and cool to obtain the product.

[0021] The polyether-modified siloxane and its esterification product in the defoamer of the present invention can quickly diffuse to the foam surface and significantly reduce the surface tension of the foam. The reduction in surface tension destroys the stability of the foam and makes the foam easy to break. The hydrosilylation product forms a stable film on the foam surface, which can prevent the further generation and diffusion of the foam. At the same time, the lubricity of the film also helps to break and dissipate the foam. The emulsification and dispersing effect of Tween 80 enables the various components in the defoamer to be evenly dispersed in the medium, thereby improving the use efficiency and stability of the defoamer. The present invention achieves effective suppression and elimination of foam through the comprehensive effects of reducing the surface tension of the foam, forming a stable film, and emulsification and dispersion.

[0022] Sample test prepared by the present invention: The defoaming agent A prepared by the method described in the article was compared with the existing polyether ester defoamer B in the surface activity.

[0023] Surfactant foaming liquid: 0.05% sodium dodecylbenzene sulfonate, 0.5% OP-10 aqueous solution Take 50 ml of the foaming liquid respectively, add 0.02 g of the defoaming agent sample respectively, put it in an oscillator and oscillate for 5 minutes, and set the temperature to 28°C. Record the foam height after stopping the oscillation and the time when the foam is completely eliminated.

[0024] .

Claims

1. A method for preparing a silicone-modified polyetherester defoamer, characterized in that: The quality formula of its raw materials is: 30-40 parts of low hydrogen silicone oil Allyl silicone oil 20-25 parts Polyether modified siloxane 12-15 parts 4-8 parts of lauric acid 3-5 parts of p-toluenesulfonic acid (TSA) catalyst 8-12 parts of polyoxyethylene polyoxypropylene ether Heptamethyltrisiloxane 10-15 parts Tween 80 1-2 servings Chloroplatinic acid catalyst The special method comprises the following steps: S1: Mix polyether-modified siloxane and lauric acid, add p-toluenesulfonic acid (TSA) catalyst, heat to 130-140°C, stir and react for 3-4 hours, and use a vacuum machine to extract 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°C, add chloroplatinic acid catalyst, then add heptamethyltrisiloxane, heat to 110-130°C, stir and react for 1-2 hours to obtain a polyether modified siloxane complex; S3: Mix the colorless transparent viscous liquid, the polyether-modified siloxane compound and Tween 80 at 30-40° C., stir for 1-2 hours, and cool to obtain the product.

2. The method for preparing a silicone-modified polyetherester defoamer according to claim 1, characterized in that: The quality formula of its raw materials is: 30 parts of low hydrogen silicone oil Allyl silicone oil 20 parts 12 parts of polyether modified siloxane 4 parts of lauric acid 3 parts of p-toluenesulfonic acid (TSA) catalyst 8 parts of polyoxyethylene polyoxypropylene ether 10 parts of heptamethyl trisiloxane Tween 80 1 serving Chloroplatinic acid catalyst is used in appropriate amount.

3. The method for preparing a silicone-modified polyetherester defoamer according to claim 1, characterized in that: The quality formula of its raw materials is: 40 parts of low hydrogen silicone oil Allyl silicone oil 25 parts 15 parts of polyether modified siloxane 8 parts of lauric acid 5 parts of p-toluenesulfonic acid (TSA) catalyst 12 parts of polyoxyethylene polyoxypropylene ether 15 parts of heptamethyl trisiloxane Tween 80 2 servings Chloroplatinic acid catalyst is used in appropriate amount.

4. The method for preparing a silicone-modified polyetherester defoamer according to claim 1, characterized in that: The quality formula of its raw materials is: 35 parts of low hydrogen silicone oil Allyl silicone oil 22 parts 14 parts of polyether modified siloxane 6 parts of lauric acid 4 parts of p-toluenesulfonic acid (TSA) catalyst 10 parts of polyoxyethylene polyoxypropylene ether 12 parts of heptamethyl trisiloxane Tween 80 2 servings Chloroplatinic acid catalyst is used in appropriate amount.

5. The method for preparing a silicone-modified polyetherester defoamer according to claim 1, characterized in that: The special method comprises the following steps: S1: Mix polyether-modified siloxane and lauric acid, add p-toluenesulfonic acid (TSA) catalyst, heat to 135°C, stir and react for 4 hours, and use a vacuum machine to extract 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 heptamethyl trisiloxane, heat to 130°C, stir and react for 2 hours to obtain a polyether modified siloxane composite; S3: Mix the colorless transparent viscous liquid, the polyether-modified siloxane compound and Tween 80, mix at 40° C., stir for 2 hours, and cool to obtain the product.