Water-based environment-friendly defoaming agent

Abstract

The invention discloses a water-based environment-friendly defoaming agent, and relates to the technical field of defoaming agents, and a preparation method of the water-based environment-friendly defoaming agent comprises the following steps: adding long-chain alkyl silicone oil, white carbon black, epoxypropane, fatty alcohol-polyoxyethylene ether and tributyl phosphate into a reaction kettle, stirring for 2-3 hours, and uniformly mixing; adding a catalyst into the reaction kettle, mixing and stirring for 8-10 hours, and adding phosphatidine iodide, cholinesterase and an enzymolysis material; and adding a stabilizer and gamma-glycidyl ether oxypropyl trimethoxy silane, adding a polyacrylic acid salt-alkali swelling type thickener 1860 and carboxylesterase which are pre-mixed in water into the reaction kettle, and uniformly mixing and stirring for 1-2 hours to obtain the water-based environment-friendly defoaming agent. According to the water-based environment-friendly defoaming agent, the low-temperature fluidity of fatty alcohol-polyoxyethylene ether can be remarkably improved, the defoaming efficiency of the defoaming agent is improved, and the defoaming agent can improve the stability and reduce the layering and precipitation phenomena during storage.

Description

Technical Field

[0001] The invention relates to the technical field of defoamers, and in particular to an aqueous environment-friendly defoamer. Background Art

[0002] Water-based environmentally friendly defoamer is a chemical additive specially used to eliminate foam in water-based systems. It is safe and environmentally friendly. Water-based environmentally friendly defoamer is mainly made of dimethyl silicone oil, white carbon black, emulsifier and other ingredients through a specific process. These ingredients are non-toxic, friendly to the human body and the environment, and will not cause adverse effects on the product. Water-based environmentally friendly defoamer can quickly reduce the surface tension of the liquid, thereby effectively destroying the structure of the foam and achieving the effect of rapid defoaming. It has a long anti-foaming time and can effectively prevent the re-generation of foam and maintain the stable operation of the system. In various harsh water environments, such as high pH or high temperature conditions, it can still maintain good defoaming performance and is not prone to property changes.

[0003] Publication No. CN109248470A discloses an environmentally friendly water-based defoamer, which is mainly prepared by mixing dimethyl silicone oil, white carbon black, fumed silica and other catalysts by a special process. The defoamer of the present invention uses dimethyl silicone oil as a basic component, replaces traditional APEO with fatty alcohol polyoxyethylene ether, and is supplemented with fumed silica and nano-silicon dioxide by a special process. The obtained product has strong defoaming ability and is more environmentally friendly. At the same time, it has stable chemical properties, has good acid and alkali resistance, has good storage stability, and has good system compatibility. At the same time, it does not affect product coating and is incompatible with existing coating systems. Therefore, it can be widely used.

[0004] After searching the above patents, it was found that although fatty alcohol polyoxyethylene ether is used in defoaming agents, it can enhance the emulsification performance, improve the defoaming efficiency, enhance environmental adaptability and provide product safety. However, in actual use, it will cause the defoaming agent to have poor fluidity in certain low-temperature environments, which limits its use in applications that require low-temperature operation. At the same time, in some cases, fatty alcohol polyoxyethylene ether may cause excessive foam generation, which is not conducive to occasions where the amount of foam needs to be controlled. In addition, during long-term storage, stratification or precipitation may occur, affecting the stability of the defoaming agent and the use effect.

[0005] Therefore, a water-based environmentally friendly defoamer is now proposed to solve the above problems. Summary of the invention

[0006] The main purpose of the present invention is to provide an aqueous environment-friendly defoamer with good low-temperature fluidity, fast defoaming efficiency, high active matter content, and is applied to the preparation of the aqueous environment-friendly defoamer.

[0007] To achieve the above object, the technical solution adopted by the present invention is: an aqueous environmentally friendly defoamer, and the preparation steps of the aqueous environmentally friendly defoamer are as follows: Step 1: Add long-chain alkyl silicone oil, white carbon black, propylene oxide, fatty alcohol polyoxyethylene ether and tributyl phosphate into a reactor, stir for 2 to 3 hours and mix evenly to obtain modified fatty alcohol polyoxyethylene ether, and at the same time increase the temperature of the reactor to 110° C. to 170° C.; Step 2: Add the catalyst into the reactor and mix and stir for 8 to 10 hours, add pralidoxime iodide, cholinesterase and enzymatic hydrolysis materials, and reduce the temperature of the materials in the reactor to 20° C. to 35° C., and continue stirring for 1 to 1.5 hours; Step 3: Add stabilizer and γ-glycidyloxypropyltrimethoxysilane, add polyacrylate alkali swellable thickener 1860 and carboxylesterase pre-mixed in water into the reactor and mix and stir evenly for 1 to 2 hours to obtain a water-based environmentally friendly defoamer.

[0008] The weight percentages of the water-based environmentally friendly defoamer are: 30% to 35% long-chain alkyl silicone oil, 5% to 5.5% white carbon black, 0.5% to 1% propylene oxide, 4% to 5% fatty alcohol polyoxyethylene ether, 20% to 26% polyacrylate alkali swelling thickener 1860, 0.5% to 3% phosphate ester, 5% to 8% stabilizer, 0.1% to 0.5% catalyst, 4% to 5% emulsifier, 4% to 5% carboxylesterase, 2% to 4% enzymatic hydrolysis material, and 3% to 5% γ-glycidyl ether oxypropyl trimethoxy silane.

[0009] The mixing mass ratio of the long-chain alkyl silicone oil, white carbon black, propylene oxide, fatty alcohol polyoxyethylene ether and phosphate is 6:1:0.1:1:0.3.

[0010] The mass ratio of pralidoxime iodide to cholinesterase to phosphate is 0.8:1:0.6.

[0011] The enzymatic hydrolysis material includes one or more of cytochrome P450 enzymes, glutathione transferase, carboxylesterase, paraoxonase and organophosphorus hydrolase.

[0012] The mass ratio of the enzymatic hydrolysis material to the phosphate ester is 2:1.

[0013] The stabilizer includes one or more of polyethylene glycol, polyvinyl alcohol, sodium polyoxyethylene fatty alcohol ether sulfate, polydimethylsiloxane and triphenyl phosphate.

[0014] The mass ratio of the stabilizer to the modified fatty alcohol polyoxyethylene ether is 0.8:1.

[0015] The modified fatty alcohol polyoxyethylene ether is prepared by mixing fatty alcohol polyoxyethylene ether and propylene oxide.

[0016] The catalyst includes one or more of KOH, p-toluenesulfonic acid and Pt catalyst.

[0017] The present invention has the following beneficial effects: 1. In the present invention, propylene oxide is introduced into fatty alcohol polyoxyethylene ether to obtain modified fatty alcohol polyoxyethylene ether, and the modified fatty alcohol polyoxyethylene ether is combined with phosphate ester, so that the prepared defoamer has extremely low surface tension and water solubility, which can not only improve the low-temperature fluidity of the defoamer, but also increase its defoaming efficiency. By introducing propylene oxide chain segments, the low-temperature fluidity of fatty alcohol polyoxyethylene ether can be significantly improved, which is particularly important for industrial applications that need to be operated at lower temperatures, because good fluidity ensures that the defoamer can still be effectively dispersed and play a role in a low-temperature environment.

[0018] 2. In the present invention, by adding pralidoxime iodide, cholinesterase and enzymatic hydrolysis materials, and combining pralidoxime iodide and cholinesterase with cytochrome P450 enzyme and glutathione transferase in the enzymatic hydrolysis materials, the modified material phosphate added in the defoamer can be enzymatically decomposed, effectively reducing the toxicity of the modified defoamer, so that it meets the environmental protection standards, and through the modified defoamer, the defoaming efficiency of the defoamer can be further improved by propylene oxide, and by introducing propylene oxide into fatty alcohol polyoxyethylene ether, the height of the foam can be effectively reduced, which directly improves the efficiency of the defoamer. The low foam property is very critical for many industrial processes because it can reduce operational problems and safety risks caused by excessive foam.

[0019] 3. In the present invention, by adding a stabilizer and γ-glycidyloxypropyltrimethoxysilane, the prepared defoamer has good water solubility and stability through the polyethylene glycol in the stabilizer, so that under low temperature conditions, the polyethylene glycol can effectively prevent the stratification and precipitation of the fatty alcohol polyoxyethylene ether. At the same time, the polyethylene glycol can form a stable two-phase aqueous system with the fatty alcohol polyoxyethylene ether, and the steric hindrance effect is used to reduce the interaction between molecules to avoid the separation of the fatty alcohol polyoxyethylene ether, so that the defoamer can increase the stability and reduce the stratification and precipitation phenomenon during storage. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The present invention is a schematic diagram of the overall process of an aqueous environmentally friendly defoamer. DETAILED DESCRIPTION

[0021] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0022] Comparative Example A water-based environmentally friendly defoamer comprises the following steps: Step 1: Add dimethyl silicone oil, white carbon black, fumed silica, fatty alcohol polyoxyethylene ether, and nano-silicon dioxide to a reactor and stir for 2-3 hours to mix evenly, while raising the temperature of the reactor to 100°C-180°C; Step 2: adding the catalyst into the reactor and reacting for 8-10 hours, and hollowing out the medium material in the material and recovering it; Step 3: Add the dispersant into the reaction kettle and mix and stir for 1-2 hours; Step 4: Lower the temperature of the material in the reactor to 20°C-35°C and continue stirring for 1-1.5 hours; Step 5: Take the anionic alkali swelling non-associative thickener ST-60 and polysorbate pre-mixed in water, add them into the reaction kettle, mix and stir evenly for 1-2 hours to obtain the final product.

[0023] The comparative example is a preparation step of the prior art for preparing an aqueous environmentally friendly defoaming agent. The comparative example is compared with Example 1, Example 2 and Example 3. The comparison results are as follows: the comparative example lacks propylene oxide and phosphate compared with Example 1, the comparative example lacks pralidoxime iodide, cholinesterase and enzymatic hydrolysis materials compared with Example 2, and the comparative example lacks stabilizer and γ-glycidyloxypropyltrimethoxysilane compared with Example 3.

[0024] Example 1 Please refer to Figure 1 As shown: A water-based environmentally friendly defoamer, the preparation steps of the water-based environmentally friendly defoamer are as follows: Step 1: Add long-chain alkyl silicone oil, white carbon black, propylene oxide, fatty alcohol polyoxyethylene ether and tributyl phosphate into a reactor, stir for 2 hours and mix evenly to obtain modified fatty alcohol polyoxyethylene ether, and at the same time increase the temperature of the reactor to 110°C; Step 2: Add the catalyst into the reactor and mix and stir for 8 hours, then lower the temperature of the material in the reactor to 20°C and continue stirring for 1 hour; Step 3: Add the polyacrylate alkali swellable thickener 1860 and carboxylesterase pre-mixed in water into the reactor and mix and stir evenly for 1 hour to obtain a water-based environmentally friendly defoamer.

[0025] The weight percentages of the water-based environmentally friendly defoamer are: long-chain alkyl silicone oil 30% to 35%, white carbon black 5% to 5.5%, propylene oxide 0.5% to 1%, fatty alcohol polyoxyethylene ether 4% to 5%, polyacrylate alkali swelling thickener 186020% to 26%, phosphate ester 0.5% to 3%, stabilizer 5% to 8%, catalyst 0.1% to 0.5%, emulsifier 4% to 5%, carboxylesterase 4% to 6%, enzymatic hydrolysis material 2% to 4%, and γ-glycidyl ether oxypropyl trimethoxy silane 3% to 5%.

[0026] The mixing mass ratio of long-chain alkyl silicone oil, white carbon black, propylene oxide, fatty alcohol polyoxyethylene ether and phosphate is 6:1:0.1:1:0.3.

[0027] Through the above-mentioned ratio, the preparation of the water-based environmentally friendly defoaming agent in Example 1 and the comparative example has the following advantages: the modified fatty alcohol polyoxyethylene ether is combined with phosphate ester, so that the prepared defoaming agent has extremely low surface tension and water solubility, which can not only improve the low-temperature fluidity of the defoaming agent, but also increase its defoaming efficiency. By introducing propylene oxide chain segments, the low-temperature fluidity of the fatty alcohol polyoxyethylene ether can be significantly improved.

[0028] Example 2 Please refer to Figure 1 As shown: A water-based environmentally friendly defoamer, the preparation steps of the water-based environmentally friendly defoamer are as follows: Step 1: Add long-chain alkyl silicone oil, white carbon black, propylene oxide, fatty alcohol polyoxyethylene ether and tributyl phosphate into a reactor, stir for 2.5 hours and mix evenly to obtain modified fatty alcohol polyoxyethylene ether, and at the same time increase the temperature of the reactor to 140°C; Step 2: Add the catalyst into the reactor and mix and stir for 9 hours, add pralidoxime iodide, cholinesterase and enzymatic hydrolysis materials, and reduce the temperature of the materials in the reactor to 27.5° C. and continue stirring for 1.2 hours; Step 3: Add stabilizer and γ-glycidyloxypropyltrimethoxysilane, add polyacrylate alkali swellable thickener 1860 and carboxylesterase pre-mixed in water into the reactor and mix and stir evenly for 1.5 hours to obtain a water-based environmentally friendly defoamer.

[0029] The mass ratio of pralidoxime iodide and cholinesterase to phosphate is 0.8:1:0.6.

[0030] The enzymatic material includes one or more of cytochrome P450 enzymes, glutathione transferases, carboxylesterases, paraoxonases and organophosphorus hydrolases.

[0031] The mass ratio of enzymatic hydrolysis material to phosphate ester is 2:1.

[0032] Through the above-mentioned ratio, the preparation of the water-based environmentally friendly defoaming agent in Example 2 and the comparative example has the following advantages: the defoaming efficiency of the defoaming agent can be further improved by propylene oxide, and the height of the foam can be effectively reduced by introducing propylene oxide into the fatty alcohol polyoxyethylene ether, which directly improves the efficiency of the defoaming agent. The low foaming property is very critical for many industrial processes because it can reduce operational problems and safety risks caused by excessive foam.

[0033] Example 3 Please refer to Figure 1As shown: A water-based environmentally friendly defoamer, the preparation steps of the water-based environmentally friendly defoamer are as follows: Step 1: Add long-chain alkyl silicone oil, white carbon black, propylene oxide, fatty alcohol polyoxyethylene ether and tributyl phosphate into a reactor, stir for 3 hours and mix evenly to obtain modified fatty alcohol polyoxyethylene ether, and at the same time increase the temperature of the reactor to 170°C; Step 2: Add the catalyst into the reactor and mix and stir for 10 hours, add pralidoxime iodide, cholinesterase and enzymatic hydrolysis materials, and reduce the temperature of the materials in the reactor to 35° C. and continue stirring for 1.5 hours; Step 3: Add stabilizer and γ-glycidyloxypropyltrimethoxysilane, add polyacrylate alkali swellable thickener 1860 and carboxylesterase pre-mixed in water into the reactor and mix and stir evenly for 2 hours to obtain a water-based environmentally friendly defoamer.

[0034] The stabilizer includes one or more of polyethylene glycol, polyvinyl alcohol, sodium polyoxyethylene fatty alcohol ether sulfate, polydimethylsiloxane and triphenyl phosphate.

[0035] The mass ratio of the stabilizer to the modified fatty alcohol polyoxyethylene ether is 0.8:1.

[0036] The modified fatty alcohol polyoxyethylene ether is prepared by mixing fatty alcohol polyoxyethylene ether and propylene oxide.

[0037] The catalyst includes one or more of KOH, p-toluenesulfonic acid and Pt catalyst.

[0038] Through the above ratio, the preparation of the water-based environmentally friendly defoamer in Example 3 and the comparative example has the following advantages: the polyethylene glycol in the stabilizer has good water solubility and stability, so that under low temperature conditions, the polyethylene glycol can effectively prevent the stratification and precipitation of the fatty alcohol polyoxyethylene ether, and the polyethylene glycol can form a stable two-phase water system with the fatty alcohol polyoxyethylene ether, and reduce the interaction between molecules through the steric hindrance effect to avoid the separation of the fatty alcohol polyoxyethylene ether. Polyvinyl alcohol is a water-soluble polymer with excellent film-forming and adhesion properties. It can form a two-phase water system with the fatty alcohol polyoxyethylene ether, and can also maintain the uniformity of the system at a lower temperature, effectively preventing stratification and precipitation. The sodium sulfate of fatty alcohol polyoxyethylene ether is an anionic nonionic surfactant with excellent foaming performance and surface activity. By compounding with other surfactants such as APG, CTAB and SDS, its performance can be further optimized, and the stratification and precipitation phenomena can be reduced. Triphenyl phosphate has extremely low surface tension and good defoaming performance. They can improve the defoaming efficiency and reduce stratification and precipitation without changing the basic properties of the defoaming agent, so that the defoaming agent can increase stability and reduce stratification and precipitation during storage.

[0039] Comparative Example 1 The water-based environmentally friendly defoaming agent provided in this comparative example is substantially the same as that in Example 1, the main difference is that in Example 1, propylene oxide is mainly introduced into the fatty alcohol polyoxyethylene ether, and phosphate is added.

[0040] Comparative Example 2 The water-based environmentally friendly defoaming agent provided in this comparative example is substantially the same as that in Example 2, the main difference is that pralidoxime iodide, cholinesterase and enzymatic hydrolysis material are added in this Example 2.

[0041] Comparative Example 3 The water-based environmentally friendly defoaming agent provided in this comparative example is substantially the same as that in Example 3, the main difference is that a stabilizer and γ-glycidyloxypropyltrimethoxysilane are added in this Example 3, and hexagonal boron nitride is added.

[0042] The test results of low temperature fluidity, defoaming speed and active matter content are shown in Table 1 below. Indicates the low temperature fluidity level. The higher the level, the better the low temperature fluidity: Table 1: Tests on low temperature fluidity, defoaming speed and active matter content:

[0043] It can be seen from the test results in the above table that the aqueous environmentally friendly defoaming agent prepared in Example 1, Example 2 and Example 3 can not only improve the low-temperature fluidity of the defoaming agent compared to the comparative example, but also increase its defoaming efficiency, ensuring that the defoaming agent can still be effectively dispersed and play a role in a low temperature environment; by introducing propylene oxide into the fatty alcohol polyoxyethylene ether, the height of the foam can be effectively reduced, which directly improves the efficiency of the defoaming agent; so that the defoaming agent can increase stability and reduce stratification and precipitation during storage.

[0044] In the present invention, a water-based environmentally friendly defoamer is provided. During the operation of the method, long-chain alkyl silicone oil, white carbon black, propylene oxide, fatty alcohol polyoxyethylene ether and tributyl phosphate are first added to a reactor and stirred for 2 to 3 hours and mixed evenly to obtain modified fatty alcohol polyoxyethylene ether. Meanwhile, the temperature of the reactor is raised to 110° C. to 170° C., and propylene oxide is introduced into the fatty alcohol polyoxyethylene ether to obtain modified fatty alcohol polyoxyethylene ether. The modified fatty alcohol polyoxyethylene ether is combined with phosphate ester, so that the prepared defoamer has extremely low surface tension and water solubility, which can not only improve the low-temperature fluidity of the defoamer, but also increase its defoaming efficiency. The introduction of propylene oxide chain segments can significantly improve the low-temperature fluidity of fatty alcohol polyoxyethylene ether, which is particularly important for industrial applications that need to operate at lower temperatures, because good fluidity ensures that the defoamer can still be effectively dispersed and function in a low-temperature environment; the catalyst is added to the reactor and mixed and stirred for 8 to 10 hours, pralidoxime iodide, cholinesterase and enzymatic hydrolysis materials are added, and the material temperature in the reactor is reduced to 20°C to 35°C, and stirring is continued for 1 to 1.5 hours, by adding pralidoxime iodide, cholinesterase and enzymatic hydrolysis materials, and combining pralidoxime iodide and cholinesterase with cytochrome P450 enzymes and glutathione transferase in the enzymatic hydrolysis materials, The modified material phosphate added to the defoamer can be enzymatically decomposed, effectively reducing the toxicity of the modified defoamer and making it meet environmental protection standards. The modified defoamer can further improve the defoaming efficiency of the defoamer through propylene oxide. By introducing propylene oxide into the fatty alcohol polyoxyethylene ether, the height of the foam can be effectively reduced, which directly improves the efficiency of the defoamer. The low-foaming property is very critical for many industrial processes because it can reduce operational problems and safety risks caused by excessive foam; stabilizers and γ-glycidyl ether oxypropyl trimethoxy silane are added to the polyacrylate alkali swelling thickener 1 pre-mixed in water. 860 and carboxylesterase are added to a reactor and mixed and stirred for 1 to 2 hours to obtain an aqueous environmentally friendly defoamer. By adding a stabilizer and γ-glycidyloxypropyltrimethoxysilane, the prepared defoamer has good water solubility and stability through the polyethylene glycol in the stabilizer, so that under low temperature conditions, the polyethylene glycol can effectively prevent the stratification and precipitation of the fatty alcohol polyoxyethylene ether. At the same time, the polyethylene glycol can form a stable two-phase aqueous system with the fatty alcohol polyoxyethylene ether, and the steric hindrance effect is used to reduce the interaction between molecules to avoid the separation of the fatty alcohol polyoxyethylene ether, so that the defoamer can increase stability and reduce stratification and precipitation during storage.

[0045] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A water-based environmentally friendly defoamer, characterized in that: The preparation steps of the water-based environmentally friendly defoamer are as follows: Step 1: Add long-chain alkyl silicone oil, white carbon black, propylene oxide, fatty alcohol polyoxyethylene ether and tributyl phosphate into a reactor, stir for 2 to 3 hours and mix evenly to obtain modified fatty alcohol polyoxyethylene ether, and at the same time increase the temperature of the reactor to 110° C. to 170° C.; Step 2: Add the catalyst into the reactor and mix and stir for 8 to 10 hours, add pralidoxime iodide, cholinesterase and enzymatic hydrolysis materials, and reduce the temperature of the materials in the reactor to 20° C. to 35° C., and continue stirring for 1 to 1.5 hours; Step 3: Add stabilizer and γ-glycidyloxypropyltrimethoxysilane, add polyacrylate alkali swellable thickener 1860 and carboxylesterase pre-mixed in water into the reactor and mix and stir evenly for 1 to 2 hours to obtain a water-based environmentally friendly defoamer.

2. The water-based environmentally friendly defoamer according to claim 1, characterized in that: The weight percentages of the water-based environmentally friendly defoamer are: 30% to 35% long-chain alkyl silicone oil, 5% to 5.5% white carbon black, 0.5% to 1% propylene oxide, 4% to 5% fatty alcohol polyoxyethylene ether, 20% to 26% polyacrylate alkali swelling thickener 1860, 0.5% to 3% phosphate ester, 5% to 8% stabilizer, 0.1% to 0.5% catalyst, 4% to 5% emulsifier, 4% to 5% carboxylesterase, 2% to 4% enzymatic hydrolysis material, and 3% to 5% γ-glycidyl ether oxypropyl trimethoxy silane.

3. The water-based environmentally friendly defoamer according to claim 1, characterized in that: The mixing mass ratio of the long-chain alkyl silicone oil, white carbon black, propylene oxide, fatty alcohol polyoxyethylene ether and phosphate is 6:1:0.1:1:0.

3.

4. The water-based environmentally friendly defoamer according to claim 1, characterized in that: The mass ratio of pralidoxime iodide to cholinesterase to phosphate is 0.8:1:0.

6.

5. The water-based environmentally friendly defoamer according to claim 1, characterized in that: The enzymatic hydrolysis material includes one or more of cytochrome P450 enzymes, glutathione transferase, carboxylesterase, paraoxonase and organophosphorus hydrolase.

6. The water-based environmentally friendly defoamer according to claim 1, characterized in that: The mass ratio of the enzymatic hydrolysis material to the phosphate ester is 2:

1.

7. The water-based environmentally friendly defoamer according to claim 1, characterized in that: The stabilizer includes one or more of polyethylene glycol, polyvinyl alcohol, sodium polyoxyethylene fatty alcohol ether sulfate, polydimethylsiloxane and triphenyl phosphate.

8. The water-based environmentally friendly defoamer according to claim 1, characterized in that: The mass ratio of the stabilizer to the modified fatty alcohol polyoxyethylene ether is 0.8:

1.

9. The water-based environmentally friendly defoamer according to claim 1, characterized in that: The modified fatty alcohol polyoxyethylene ether is prepared by mixing fatty alcohol polyoxyethylene ether and propylene oxide.

10. The water-based environmentally friendly defoamer according to claim 1, characterized in that: The catalyst includes one or more of KOH, p-toluenesulfonic acid and Pt catalyst.

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