A GP type polyether emulsion defoamer and a preparation method thereof

Abstract

The application belongs to the technical field of defoaming agents, and discloses a GP type polyether emulsion defoaming agent and a preparation method thereof.The GP type polyether emulsion defoaming agent comprises low-viscosity glycerol polyoxypropylene ether, high-viscosity glycerol polyoxypropylene ether, an emulsifier and water; the viscosity of the low-viscosity glycerol polyoxypropylene ether is 50-200 mPa·s; the viscosity of the high-viscosity glycerol polyoxypropylene ether is 1000-3000 mPa·s; and the emulsifier comprises a low-water-solubility emulsifier and a steric-hindrance non-ionic emulsifier.The steric-hindrance non-ionic emulsifier is compounded with the low-water-solubility emulsifier, so that the defoaming agent composed of the high-viscosity and low-viscosity glycerol polyoxypropylene ethers forms an emulsion system with good emulsion stability, the defoaming performance of which is greatly improved compared with GP polyether, and the foam inhibition capacity and efficiency are significantly improved; and the emulsion system has strong storage stability and is not prone to precipitation.

Description

Technical Field

[0001] This invention belongs to the field of defoamer technology, specifically relating to a GP-type polyether emulsion defoamer and its preparation method. Background Technology

[0002] GP-type polyethers are a class of polyether compounds produced by the addition polymerization of propylene oxide with glycerol as an initiator. Due to their simple synthesis, reasonable price, stability, and environmental friendliness, they were widely used in the early pharmaceutical, food, and brewing industries. However, due to their poor hydrophilicity and low solubility in foaming media, their overall defoaming effect was poor, leading to the gradual phasing out of GP-type defoamers. Currently, they are only used in thin fermentation broths to control foam throughout the fermentation process. Improvements to GP-type polyether defoamers mainly focus on their structure. Based on GP-type polyethers, researchers have developed GPE-type polyethers and GPES-type polyether esters. GPE-type defoamers are made by adding a certain proportion of polyethylene oxide to the original GP-type polyether, improving hydrophilicity and thus improving defoaming effect. However, the defoaming effect of GPE-type polyethers is still not ideal, limiting their application areas. Based on GPE-type polyethers, researchers have further developed GPES, which involves end-capping the GPE-type defoamer chain with hydrophobic fatty acid esters. GPES-type polyethers have achieved good defoaming effects, but the synthesis process of GPES-type polyethers is complex and the cost of use is high.

[0003] Emulsification can also increase the hydrophilicity of hydrophobic defoamers, resulting in better dispersibility of the defoaming system, and it has the advantage of lower cost compared to synthetic methods that improve the structure. Emulsification is already quite common in improving the defoaming properties of fatty alcohols and glycerides. However, emulsification of GP-type polyethers is relatively difficult, and even if a relatively stable emulsion is obtained, its defoaming effect is often weakened.

[0004] Therefore, there is an urgent need to provide a GP-type polyether defoamer that is low in cost, has good stability, and strong defoaming ability. Summary of the Invention

[0005] To overcome the shortcomings of existing technologies, the present invention aims to provide a GP-type polyether emulsion defoamer and its preparation method. The GP-type polyether emulsion defoamer provided by the present invention has strong defoaming ability, long-lasting foam suppression, and strong storage stability; moreover, it has a lower cost compared to GPES-type polyether defoamers.

[0006] The first aspect of this invention provides a GP-type polyether emulsion defoamer.

[0007] Specifically, a GP-type polyether emulsion defoamer comprises low-viscosity glycerol polyoxypropylene ether, high-viscosity glycerol polyoxypropylene ether, emulsifier, and water;

[0008] The viscosity of the low-viscosity glycerol polyoxypropylene ether is 50-200 mPa·s; the viscosity of the high-viscosity glycerol polyoxypropylene ether is 1000-3000 mPa·s.

[0009] The emulsifiers include low water-soluble emulsifiers and sterically hindered nonionic emulsifiers.

[0010] Glyceryl polyoxypropylene ether, as an antifoaming active material, exhibits increased hydrophobicity and viscosity with increasing propylene oxide addition number. Compared to low molecular weight glyceryl polyoxypropylene ether, high molecular weight glyceryl polyoxypropylene ether has stronger antifoaming ability, but its high viscosity hinders diffusion, resulting in low antifoaming efficiency. Low molecular weight glyceryl polyoxypropylene ether has poor antifoaming ability but good diffusion performance. This invention utilizes a combination of low-viscosity and high-viscosity glyceryl polyoxypropylene ether, and with the combined action of a low-water-soluble emulsifier and a sterically hindered nonionic emulsifier, it can reduce the system viscosity, resulting in an antifoaming agent with strong antifoaming ability, high antifoaming efficiency, and strong stability.

[0011] This invention utilizes a combination of a low-water-soluble emulsifier and a sterically hindered nonionic emulsifier. This not only provides hydrophilic interaction sites for glycerol polyoxypropylene ether, helping the defoaming active substance (glycerol polyoxypropylene ether) to approach the foam liquid film and replace the foam-stabilizing substances on the foam liquid film, thereby achieving the effect of destroying the liquid film; but also improves the compatibility of glycerol polyoxypropylene ether by using a low-water-soluble emulsifier and a sterically hindered nonionic emulsifier, which is beneficial for obtaining a stable emulsion and an emulsion system with high foam suppression efficiency.

[0012] Because emulsifying glycerol polyoxypropylene ether is relatively difficult, even when a stable emulsion is obtained, its defoaming effect is poor. Therefore, the selection of emulsifiers must simultaneously ensure the compatibility of the defoamer, the stability of the emulsion, and the efficiency of emulsification. Using anionic or cationic emulsifiers will generate more foam themselves, which is detrimental to defoaming. Common nonionic emulsifiers cannot provide good water-emulsion dispersion stability for the emulsion system of this invention. By selecting both low-viscosity and high-viscosity glycerol polyoxypropylene ethers, and then choosing a low-water-soluble emulsifier and a sterically hindered nonionic emulsifier for emulsification, the compatibility of the system can be improved, the stability and efficiency of the emulsion can be enhanced, and the GP-type polyether emulsion defoamer can achieve strong defoaming ability and long-lasting foam suppression effect.

[0013] Preferably, the mass ratio of the low-viscosity glycerol polyoxypropylene ether to the high-viscosity glycerol polyoxypropylene ether is (0.1-1):1; more preferably, the mass ratio of the low-viscosity glycerol polyoxypropylene ether to the high-viscosity glycerol polyoxypropylene ether is (0.3-0.8):1; more preferably, the mass ratio of the low-viscosity glycerol polyoxypropylene ether to the high-viscosity glycerol polyoxypropylene ether is (0.4-0.75):1.

[0014] Preferably, the low water-soluble emulsifier is selected from at least one of Span 60, Span 80, Span 85, AEO3, octadecylamine polyoxyethylene ether 3-5EO, and phenacetin O-3-5EO.

[0015] Preferably, the sterically hindered nonionic emulsifier is selected from at least one of Tween 20, Tween 80, octadecylamine polyoxyethylene ether 20-30EO, AEO30, isotridecyl alcohol polyoxyethylene ether 15EO-30EO, castor oil polyoxyethylene ether 60EO-80EO, PEG1000 oleic acid monoester, and PEG1000 lauric acid monoester.

[0016] Preferably, the emulsifier further includes a generally water-soluble emulsifier selected from at least one of the following: isomeric tridecyl alcohol polyoxyethylene ether 5EO-15EO, castor oil polyoxyethylene ether 10EO-40EO, PEG400 oleic acid diester, PEG600 oleic acid diester, PEG400 laurate diester, PEG600 laurate diester, PEG400 oleic acid monoester, PEG600 oleic acid monoester, PEG400 laurate monoester, PEG600 laurate monoester, AEO4-15, dodecylamine polyoxyethylene ether 3-10EO, and octadecylamine polyoxyethylene ether 6-20EO. By combining a generally water-soluble emulsifier with a low-water-soluble emulsifier and a sterically hindered nonionic emulsifier, the defoaming ability, defoaming efficiency, and stability of the defoamer can be further improved.

[0017] Preferably, the water-soluble emulsifier accounts for 5%-15% of the mass percentage of the GP type polyether emulsion defoamer; more preferably, the water-soluble emulsifier accounts for 5-10% of the mass percentage of the GP type polyether emulsion defoamer.

[0018] Preferably, the low water-soluble emulsifier accounts for 3%-8% of the mass percentage of the GP type polyether emulsion defoamer; more preferably, the low water-soluble emulsifier accounts for 3%-6% of the mass percentage of the GP type polyether emulsion defoamer.

[0019] Preferably, the sterically hindered nonionic emulsifier accounts for 1%-6% of the mass percentage of the GP type polyether emulsion defoamer; more preferably, the sterically hindered nonionic emulsifier accounts for 2%-5% of the mass percentage of the GP type polyether emulsion defoamer.

[0020] Preferably, the GP-type polyether emulsion defoamer further includes a thickener. The thickener, through interaction with low-viscosity glycerol polyoxypropylene ether and high-viscosity glycerol polyoxypropylene ether, further adjusts the viscosity of the system, slows down the sedimentation of the emulsion defoamer, and extends the storage time of the GP-type polyether emulsion defoamer.

[0021] Preferably, the thickener includes at least one of PEG2000, carboxymethyl cellulose, and sodium polyacrylate.

[0022] Preferably, the GP-type polyether emulsion defoamer further includes a balance regulator.

[0023] Preferably, the balance regulator includes at least one of oleic acid, lauric acid, and acetic acid. Adding balance regulators such as oleic acid, lauric acid, or acetic acid to the GP-type polyether emulsion defoamer can help the GP-type polyether emulsion form a higher liquid film strength and prevent oil separation.

[0024] Preferably, the GP type polyether emulsion defoamer, by weight, comprises 5-15 parts of low-viscosity glycerol polyoxypropylene ether, 15-30 parts of high-viscosity glycerol polyoxypropylene ether, 10-30 parts of emulsifier, 1-5 parts of balance regulator, 0.2-2 parts of thickener and 30-70 parts of water.

[0025] More preferably, by weight, the GP type polyether emulsion defoamer comprises 8-15 parts of low-viscosity glycerol polyoxypropylene ether, 15-30 parts of high-viscosity glycerol polyoxypropylene ether, 10-25 parts of emulsifier, 1-3 parts of balance regulator, 0.2-2 parts of thickener and 40-60 parts of water.

[0026] More preferably, the GP type polyether emulsion defoamer, by weight, comprises 10-15 parts of low-viscosity glycerol polyoxypropylene ether, 20-30 parts of high-viscosity glycerol polyoxypropylene ether, 10-20 parts of emulsifier, 1-3 parts of balance regulator, 0.2-2 parts of thickener and 40-55 parts of water.

[0027] The second aspect of this invention provides a method for preparing a GP-type polyether emulsion defoamer.

[0028] Specifically, a method for preparing a GP-type polyether emulsion defoamer includes the following steps:

[0029] (1) Mix low-viscosity glycerol polyoxypropylene ether with high-viscosity glycerol polyoxypropylene ether to obtain polyether liquid; melt the emulsifier to obtain emulsifier liquid;

[0030] (2) The polyether liquid is mixed with the emulsifier liquid, the balance regulator and the thickener to obtain a mixture; then the mixture is mixed with water to obtain GP type polyether emulsion defoamer.

[0031] More specifically, a method for preparing a GP-type polyether emulsion defoamer includes the following steps:

[0032] (1) Add low-viscosity glycerol polyoxypropylene ether to high-viscosity glycerol polyoxypropylene ether and mix evenly at 45-60℃ to obtain polyether liquid; melt the emulsifier at 50-70℃ and stir evenly to obtain clear and transparent emulsifier liquid.

[0033] (2) The polyether liquid is added in a thin stream to the emulsifier liquid being stirred; then a balance regulator and a thickener are added, and the mixture is stirred at 50-70°C for 20-60 minutes to obtain a mixture; the mixture is then cooled and added in a thin stream to water being stirred to obtain a stable GP type polyether emulsion defoamer.

[0034] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0035] (1) This invention provides a GP type polyether emulsion defoamer, which combines a sterically hindered nonionic emulsifier with a low water-soluble emulsifier to form an emulsion system with good emulsification stability composed of high and low viscosity glycerol polyoxypropylene ether. Compared with GP polyether, the defoaming performance of this emulsion system (GP type polyether emulsion defoamer) is greatly improved, the foam suppression ability and foam suppression efficiency are significantly improved, the defoaming time is only 1-3 minutes, and the foam suppression time is as long as 60 minutes; and the emulsion system (GP type polyether emulsion defoamer) has strong storage stability and is not easy to precipitate.

[0036] (2) The GP type polyether emulsion defoamer provided by the present invention has readily available raw material components. Compared with the GPES type polyether defoamer, it does not require a complex synthesis process, has a lower cost, and is harmless to the environment.

[0037] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. Detailed Implementation

[0038] Example 1

[0039] This embodiment provides a GP type polyether emulsion defoamer, which is composed of the following components based on a total mass of 100 parts: 20 parts high viscosity glycerol polyoxypropylene ether (2500 mPa·s), 15 parts low viscosity glycerol polyoxypropylene ether (100 mPa·s), 3 parts PEG600 oleic acid diester, 3 parts octadecylamine polyoxyethylene ether 10EO, 2 parts Tween 20, 5 parts Span 80, 2 parts castor oil polyoxyethylene ether 40EO, 2 parts oleic acid, 1 part carboxymethyl cellulose, and the balance being pure water.

[0040] This embodiment also provides a method for preparing a GP-type polyether emulsion defoamer, including the following steps:

[0041] (1) Pour low viscosity glycerol polyoxypropylene ether into high viscosity glycerol polyoxypropylene ether and mix evenly at 50°C to obtain polyether liquid; melt each emulsifier at 60°C and stir evenly until a clear and transparent emulsifier liquid is obtained.

[0042] (2) The polyether liquid obtained in step (1) is added to the stirred emulsion liquid in a thin stream; then the balance regulator and thickener are added, and the mixture is stirred at 60°C for 30 minutes to obtain a mixture; after stirring, the mixture is cooled to room temperature, and finally the cooled mixture is added to the stirred pure water in a thin stream to obtain a stable GP type polyether emulsion defoamer.

[0043] Example 2

[0044] This embodiment provides a GP type polyether emulsion defoamer, which is composed of the following components based on a total mass of 100 parts: 25 parts high viscosity glycerol polyoxypropylene ether (2500 mPa·s), 10 parts low viscosity glycerol polyoxypropylene ether (100 mPa·s), 3 parts PEG600 oleic acid diester, 3 parts octadecylamine polyoxyethylene ether 15EO, 2 parts Tween 20, 5 parts Span 80, 2 parts castor oil polyoxyethylene ether 20EO, 2 parts oleic acid, 1 part carboxymethyl cellulose, and the balance being pure water.

[0045] The preparation method of the GP type polyether emulsion defoamer provided in this embodiment is the same as that in Embodiment 1.

[0046] Example 3

[0047] This embodiment provides a GP type polyether emulsion defoamer, which is composed of the following components based on a total mass of 100 parts: 20 parts high viscosity glycerol polyoxypropylene ether (1500 mPa·s), 15 parts low viscosity glycerol polyoxypropylene ether (150 mPa·s), 5 parts PEG600 laurate diester, 2 parts dodecylamine polyoxyethylene ether 5EO, 2 parts Tween 80, 5 parts Span 85, 3 parts castor oil polyoxyethylene ether 40EO, 2 parts acetic acid, 1 part PEG2000, and the balance being pure water.

[0048] The preparation method of the GP type polyether emulsion defoamer provided in this embodiment is the same as that in Embodiment 1.

[0049] Example 4

[0050] This embodiment provides a GP type polyether emulsion defoamer, which is composed of the following components based on a total mass of 100 parts: 25 parts high viscosity glycerol polyoxypropylene ether (1500 mPa·s), 10 parts low viscosity glycerol polyoxypropylene ether (150 mPa·s), 3 parts PEG600 laurate diester, 2 parts dodecylamine polyoxyethylene ether 10EO, 2 parts Tween 80, 5 parts Span 85, 3 parts castor oil polyoxyethylene ether 20EO, 2 parts acetic acid, 1 part PEG2000, and the balance being pure water.

[0051] The preparation method of the GP type polyether emulsion defoamer provided in this embodiment is the same as that in Embodiment 1.

[0052] Example 5

[0053] This embodiment provides a GP type polyether emulsion defoamer, which is composed of the following components based on a total mass of 100 parts: 20 parts high viscosity glycerol polyoxypropylene ether (2000 mPa·s), 15 parts low viscosity glycerol polyoxypropylene ether (80 mPa·s), 3 parts PEG600 oleic acid monoester, 2 parts PEG400 lauric acid monoester, 2 parts AEO30, 5 parts Span 60, 3 parts castor oil polyoxyethylene ether 20EO, 2 parts lauric acid, 1 part sodium polyacrylate, and the balance being pure water.

[0054] The preparation method of the GP type polyether emulsion defoamer provided in this embodiment is the same as that in Embodiment 1.

[0055] Example 6

[0056] This embodiment provides a GP type polyether emulsion defoamer, which, based on a total mass of 100 parts, consists of the following components: 25 parts high viscosity glycerol polyoxypropylene ether (2000 mPa·s), 10 parts low viscosity glycerol polyoxypropylene ether (80 mPa·s), 3 parts PEG600 oleic acid diester, 2 parts PEG400 oleic acid monoester, 3 parts isomeric tridecyl alcohol polyoxyethylene ether 20EO, 5 parts Span 80, 2 parts castor oil polyoxyethylene ether 20EO, 2 parts oleic acid, 1 part sodium polyacrylate, and the balance being pure water.

[0057] The preparation method of the GP type polyether emulsion defoamer provided in this embodiment is the same as that in Embodiment 1.

[0058] Comparative Example 1

[0059] The difference between Comparative Example 1 and Example 4 is that the low water-soluble Span 85 is replaced with an equal amount of sterically hindered Tween 80 (i.e., no low water-soluble emulsifier is used), while the other components and preparation methods are the same as in Example 4.

[0060] Comparative Example 2

[0061] The difference between Comparative Example 2 and Example 4 is that the sterically hindered Tween 80 was replaced with an equal amount of the low water-soluble Span 85 (i.e., no sterically hindered emulsifier was used), while the other components and preparation methods were the same as in Example 4.

[0062] Comparative Example 3

[0063] The difference between Comparative Example 3 and Example 4 is that the high-viscosity glycerol polyoxypropylene ether (1500 mPa·s) was replaced with an equal amount of low-viscosity glycerol polyoxypropylene ether (150 mPa·s), that is, only the low-viscosity glycerol polyoxypropylene ether was used, and the remaining components and preparation methods were the same as in Example 4.

[0064] Comparative Example 4

[0065] The difference between Comparative Example 4 and Example 4 is that the low-viscosity glycerol polyoxypropylene ether (150 mPa·s) was replaced with an equal amount of high-viscosity glycerol polyoxypropylene ether (1500 mPa·s), that is, only the high-viscosity glycerol polyoxypropylene ether was used, and the other components and preparation methods were the same as in Example 4.

[0066] Product effectiveness test

[0067] (1) Stability test of GP type polyether emulsion defoamer

[0068] Take 10 mL of the GP-type polyether emulsion defoamer prepared in each example and place it in a 10 mL centrifuge tube. Centrifuge at 3000 rpm for 3 min and record whether there are any changes in the appearance of the emulsion or whether there is any precipitation at the bottom. No change or precipitation indicates that the GP-type polyether emulsion defoamer has strong stability.

[0069] (2) Foam suppression ability test

[0070] Preparation of defoaming solution: Weigh 3.0g of sodium dodecylbenzenesulfonate and place it in a beaker. Dissolve it completely in deionized water and bring the volume to 1L. Shake well to obtain a 0.3% sodium dodecylbenzenesulfonate aqueous solution, which will be used as the foaming solution.

[0071] Add 200 ml of foaming solution to a 1 L graduated cylinder, then add 0.10 g of the GP-type polyether emulsion defoamer prepared in Examples 1-6 for testing. After adding the GP-type polyether emulsion defoamer, shake well and bubble the mixture using an oxygen pump at a flow rate of 1200 ml / min. Record the time required for the foam height to reach the top (1 L mark), which is called the foam suppression time. The longer the foam suppression time, the better the foam suppression performance of the defoamer.

[0072] (3) Foam suppression efficiency test

[0073] The foam suppression test method is the same as (2). The minimum amount of defoamer required to test the foam suppression time of 10 minutes is the smaller the amount required, the higher the foam suppression efficiency.

[0074] (4) Defoaming performance test

[0075] Add 200ml of foaming solution to a 1L graduated cylinder. Maintain a constant temperature and aerate the solution using an oxygen pump at a flow rate of 1200ml / min. When the foam reaches the top (1L mark), add 0.1% GP type polyether emulsion defoamer and stop aerating. Record the time it takes for all the foam to disappear; this is the defoaming time. The shorter the defoaming time, the better the defoaming performance of the defoamer.

[0076] The test data of the GP type polyether emulsion defoamer provided in the various embodiments of the present invention are shown in Table 1, and are compared with the test data of glycerol polyoxypropylene ether (control example) with a viscosity of 1500 mPa·s.

[0077] Table 1

[0078]

[0079]

[0080] As shown in Table 1, the GP-type polyether emulsion defoamer provided by this invention exhibits significantly improved stability and defoaming / suppression capabilities compared to glycerol polyoxypropylene ether (comparative example). Furthermore, the GP-type polyether emulsion defoamers prepared in each embodiment demonstrate good stability, with only slight precipitation observed in Examples 2 and 3. Example 4 of this invention exhibits the longest suppression time and efficiency, along with emulsion stability and good defoaming performance, making it the optimal defoamer composition in this invention. Without a low-water-soluble emulsifier (Comparative Example 1) or without a sterically hindered nonionic emulsifier (Comparative Example 2), the emulsion stability is poor, and almost none exhibits foam suppression capability. However, without a low-water-soluble emulsifier (Comparative Example 1), the defoaming effect is good, while without a sterically hindered nonionic emulsifier (Comparative Example 2), the defoaming effect is also poor. This may be because the defoamer emulsion has many hydrophilic sites, making it easier to insert into the bubble film and exert its effect, thus achieving rapid defoaming. Using only high-viscosity glycerol polyoxypropylene ether as the oil phase resulted in poorer defoaming time and efficiency (Comparative Example 3), while using only low-viscosity glycerol polyoxypropylene ether (Comparative Example 4) as the oil phase showed no significant defoaming or foam suppression capabilities. This indicates that using a blend of high and low viscosity glycerol polyoxypropylene ether oil phases can achieve better defoaming and foam suppression effects. The GP-type polyether emulsion defoamer provided by this invention can be directly added to foaming liquids to function, making it convenient to use, and the raw materials are all polyethers, making it environmentally friendly and pollution-free.

[0081] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. 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, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A GP-type polyether emulsion defoamer, characterized in that, It contains low-viscosity glycerol polyoxypropylene ether, high-viscosity glycerol polyoxypropylene ether, emulsifier and water; The viscosity of the low-viscosity glycerol polyoxypropylene ether is 50-200 mPa·s; the viscosity of the high-viscosity glycerol polyoxypropylene ether is 1000-3000 mPa·s; the mass ratio of the low-viscosity glycerol polyoxypropylene ether to the high-viscosity glycerol polyoxypropylene ether is (0.3-0.8):1; The emulsifier includes a low-water-soluble emulsifier, a sterically hindered nonionic emulsifier, and a generally water-soluble emulsifier; the low-water-soluble emulsifier is selected from at least one of Span 60, Span 80, and Span 85; the sterically hindered nonionic emulsifier is selected from at least one of Tween 20 and Tween 80; the generally water-soluble emulsifier is selected from at least two of castor oil polyoxyethylene ether 10EO-40EO, PEG600 oleic acid diester, PEG600 laurate diester, dodecylamine polyoxyethylene ether 5EO-10EO, and octadecylamine polyoxyethylene ether 10EO-15EO. The general water-soluble emulsifier accounts for 5%-15% of the mass percentage of the GP type polyether emulsion defoamer; the low water-soluble emulsifier accounts for 3%-8% of the mass percentage of the GP type polyether emulsion defoamer; and the sterically hindered nonionic emulsifier accounts for 1%-6% of the mass percentage of the GP type polyether emulsion defoamer.

2. The GP-type polyether emulsion defoamer according to claim 1, characterized in that, The GP-type polyether emulsion defoamer also includes a thickener and a balance regulator.

3. The GP-type polyether emulsion defoamer according to claim 2, characterized in that, The balance regulator includes at least one of oleic acid, lauric acid, and acetic acid.

4. The GP-type polyether emulsion defoamer according to claim 2, characterized in that, The GP type polyether emulsion defoamer, based on a total mass of 100 parts, is composed of 8-15 parts low-viscosity glycerol polyoxypropylene ether, 15-30 parts high-viscosity glycerol polyoxypropylene ether, 10-25 parts emulsifier, 1-3 parts balance regulator, 0.2-2 parts thickener, and 40-60 parts water.

5. The method for preparing the GP-type polyether emulsion defoamer according to any one of claims 2-4, characterized in that, Includes the following steps: (1) Mix low-viscosity glycerol polyoxypropylene ether with high-viscosity glycerol polyoxypropylene ether to obtain polyether liquid; melt the emulsifier to obtain emulsifier liquid; (2) The polyether liquid is mixed with the emulsifier liquid, balance regulator and thickener to obtain a mixture; then the mixture is mixed with water to obtain GP type polyether emulsion defoamer.

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