Rhamnolipid composition for cleaning silicone oil, and industrial cleaning agent

Abstract

The present invention provides a rhamnolipid composition for cleaning silicone oil, comprising, in parts by weight, 10-50 parts of Rha-C10C10 rhamnolipid and 35-85 parts of RhaRha-C10C10 rhamnolipid. The present invention further provides a use of the rhamnolipid composition, and a cleaning agent composition and an industrial cleaning agent which comprise the rhamnolipid composition. The rhamnolipid composition provided by the present invention achieves a balance among emulsibility, wettability and foamability, has high cleaning capability and high cleaning speed, and is very suitable for cleaning and removing silicone oil in the industrial field. The industrial cleaning agent provided by the present invention has excellent silicone oil removing capability, has very wide application potential in the field of industrial cleaning, and is suitable for large-scale production and application.

Description

Rhamnolipid composition for cleaning silicone oil and industrial cleaning agent Technical Field

[0001] The present invention relates to the technical field of industrial cleaning, in particular to a rhamnolipid composition for cleaning silicone oil, and also to a cleaning agent composition and an industrial cleaning agent comprising the rhamnolipid composition. Background Art

[0002] Silicone oil (generally dimethyl silicone oil, also known as methyl silicone oil) is a common type of oil used in industrial production. As the application of silicone oil continues to expand, some manufacturing processes require the use of silicone oil for insulation or lubrication. However, after application, silicone oil residue often remains on the surface of the product or in the manufacturing process, necessitating deep cleaning of the silicone oil. However, silicone oil has good spreadability and permeability. The lipophilic end of currently available surfactants is generally a long-chain hydrocarbon structure, which has poor compatibility with silicone oil and poor permeability. Therefore, it is difficult to completely remove residual silicone oil, especially silicone oil adhering to the surface of products or production equipment.

[0003] Rhamnolipids are biosurfactants produced by Pseudomonas or Burkholderia bacteria. Their structure typically consists of a hydrophilic portion consisting of one to two rhamnose rings (sugar groups) and a hydrophobic portion consisting of one to two saturated or unsaturated fatty acids (lipids) of varying carbon chain lengths. As simple-to-prepare, environmentally friendly biosurfactants, rhamnolipids have been widely used in various cleaning applications, including industrial and civilian applications. For example, Chinese patent application CN 114456880A discloses a rhamnolipid kitchen heavy oil stain cleaner and its preparation method. This preparation method utilizes rhamnolipids containing only a small amount of monorhamnolipids, with a proportion of at least 80% disrhamnolipids. The hydrophilic groups in disrhamnolipids are more hydrophilic, making them more effective in breaking down oil stains. Chinese patent application CN 104095765A discloses a mixture composition containing rhamnolipids and a method for preparing the mixture. The mixture comprises 51-95% by weight of di-RL-C10C10 and 0.5-9% by weight of mono-RL-C10C10 and can be used for skin care or skin cleansing. It is not difficult to see that in the applications of these rhamnolipids, a higher content of di-rhamnolipid is generally required because it has better cleansing ability.

[0004] Due to the difficulty in removing silicone oil, the existing cleaning agents are difficult to achieve ideal cleaning effects, and there are no reports on the application of rhamnolipids in silicone oil cleaning. Therefore, there is an urgent need to develop an industrial cleaning agent containing rhamnolipids suitable for silicone oil cleaning.

[0005] Summary of the Invention

[0006] To overcome the deficiencies in the prior art, an object of the present invention is to provide a rhamnolipid composition for cleaning silicone oil. By formulating specific rhamnolipid types, the resulting composition has both excellent wettability and emulsification ability, is particularly suitable for cleaning and removing industrial silicone oil, has a fast cleaning speed and excellent cleaning effect, and has strong industrial applicability.

[0007] Another object of the present invention is to provide a cleaning agent composition and an industrial cleaning agent comprising the rhamnolipid composition.

[0008] A first aspect of the present invention provides a rhamnolipid composition for cleaning silicone oil, wherein the rhamnolipid composition comprises, by weight, 10 to 50 parts of Rha-C10C10 rhamnolipid and 35 to 85 parts of RhaRha-C10C10 rhamnolipid.

[0009] The Rha-C10C10 and RhaRha-C10C10 rhamnolipids of the present invention have a structure commonly used in the art, and their structural formulas are as follows (wherein Rha represents a sugar ring, the left side is Rha-C10C10 type, and the right side is RhaRha-C10C10 type):

[0010] Rhamnolipid has good permeability and contains a sugar ring structure, which can penetrate deep into oil stains. Compared with the surfactants of other carbon-based structures, cleaning efficiency is stronger, and rhamnolipid can achieve complete degradation in nature, which is in line with current environmental protection concepts. The inventors have found that for the cleaning of silicone oil, it is not only necessary for a cleaning agent to have a higher emulsifying ability, but it is also necessary to have a higher wettability at the same time, RhaRha-C10C10 type rhamnolipid has a higher hydrophilicity, a strong emulsifying ability, and has a higher foaming property, but its wettability is poor, and it is not suitable for the cleaning of silicone oil. Rha-C10C10 type rhamnolipid has higher wettability and low foaming property due to small steric hindrance, but its cleaning ability is relatively low. Therefore, the inventors have obtained the appropriate composition ratio of the two through a large number of experiments, and the rhamnolipid composition thus obtained can have both excellent wettability and cleaning ability, and is therefore very suitable for the cleaning of silicone oil, especially the equipment or components such as the tank body, pipeline containing silicone oil.

[0011] In some preferred embodiments, the rhamnolipid composition can include 20 to 40 parts (for example, about 20 parts, about 25 parts, about 30 parts, about 35 parts, about 40 parts, or any weight range) of Rha-C10C10 rhamnolipid and 40 to 60 parts (for example, about 40 parts, about 45 parts, about 50 parts, about 55 parts, about 60 parts, or any weight range) of RhaRha-C10C10 rhamnolipid, based on weight.

[0012] In some preferred embodiments, the rhamnolipid composition may further include one or more of the following rhamnolipid types, by weight: 0.1 to 10 parts of RhaRha-C8C10 type, 0.1 to 2 parts of Rha-C8C10 type, 0.5 to 20 parts of RhaRha-C10C12 type, 0.1 to 10 parts of RhaRha-C10C12:1 type, 0.1 to 5 parts of Rha-C10C12 type, and 0.1 to 5 parts of Rha-C10C12:1 type.

[0013] In some more preferred embodiments, the rhamnolipid composition may further include one or more of the following rhamnolipid types, measured by weight: 0.2 to 5 parts of RhaRha-C8C10 type, 0.3 to 1 parts of Rha-C8C10 type, 5 to 10 parts of RhaRha-C10C12 type, 0.2 to 5 parts of RhaRha-C10C12:1 type, 0.2 to 2.5 parts of Rha-C10C12 type, and 0.2 to 2.5 parts of Rha-C10C12:1 type.

[0014] The rhamnolipid of the present invention can be rhamnolipid and its salts, including inorganic salts and organic salts of rhamnolipid, wherein the inorganic salts include but are not limited to K + 、Na + Mg 2+ , Ca 2+ 、Al 3+ etc. metal salts; organic salts include but are not limited to NH 4+ , salts formed by primary amines, secondary amines, tertiary amines, etc. with rhamnolipids.

[0015] The rhamnolipid of the present invention can be a mixture obtained by compounding pure rhamnolipids of various types, or can be a concentrated fermentation broth produced by fermentation. In some preferred embodiments, the rhamnolipid composition is a concentrated fermentation broth produced by fermentation of Pseudomonas aeruginosa. The fermentation method can be a commonly used method in the art. The ratio of the rhamnolipid composition of the present invention can be obtained by adjusting the fermentation conditions.

[0016] The rhamnolipid composition provided by the present invention may further include a defoamer. Compared to other low-foaming surfactants, rhamnolipids have moderate foaming properties, and dirhamnolipid in particular has high foaming properties. Low foaming properties are generally required in the industrial cleaning field. Therefore, adding a defoamer to the rhamnolipid system can significantly reduce foaming properties, further improving the cleaning ability and cleaning effect of silicone oil.

[0017] When the rhamnolipid composition provided by the present invention is derived from a fermentation broth, the defoaming agent can be added in two ways: one is to add the defoaming agent according to the required concentration after obtaining the fermentation broth with a determined composition; the other is to add a portion of the defoaming agent during the fermentation process, and after quantitatively confirming the concentration (for example, by HPLC quantification), add the defoaming agent to reach the required concentration.

[0018] In the rhamnolipid composition provided by the present invention, the defoaming agent can be selected from the types commonly used in the field of cleaning agents or other fields, including but not limited to emulsified silicone oil, polyoxyethylene polyoxypropylene pentaerythritol ether, polyoxyethylene polyoxypropanolamine ether, polyoxypropylene glycerol ether, polyoxypropylene oxyethylene glycerol ether, polydimethylsiloxane, sorbitol, higher fatty acid defoaming agents (such as oleic acid, linoleic acid, stearic acid, palmitic acid, etc.), food defoaming agents (such as sucrose fatty acid ester defoaming agents, polyglycerol fatty acid ester defoaming agents, polyether defoaming agents, etc., which are defoaming agents or surfactants used in the food field).

[0019] In some preferred embodiments, the defoaming agent can be an organosilicon defoaming agent such as emulsified silicone oil, polydimethylsiloxane, etc., which can increase the compatibility of rhamnolipid and silicone oil to improve the cleaning effect.

[0020] In some preferred embodiments, the amount of the defoaming agent can be 0.1 to 10 wt.% of the total weight of all rhamnolipid types (for example, about 0.1 wt.%, about 0.5 wt.%, about 1 wt.%, about 2 wt.%, about 3 wt.%, about 4 wt.%, about 5 wt.%, about 6 wt.%, about 7 wt.%, about 8 wt.%, about 9 wt.%, about 10 wt.%, or any weight percentage interval). When the defoaming agent content is high, it is easy to form micelles with larger diameters, and the permeability to the silicone oil surface becomes poor, so the amount of the defoaming agent should not be too high. In some more preferred embodiments, the amount of the defoaming agent can be 1 to 5 wt.% of the total weight of all rhamnolipid types.

[0021] A second aspect of the present invention provides use of the rhamnolipid composition described in any one of the above technical solutions in the preparation of a cleaning agent.

[0022] In some preferred embodiments, the cleaning agent may be an industrial cleaning agent used to clean silicone oil.

[0023] The third aspect of the present invention provides a cleaning composition, comprising the rhamnolipid composition described in any one of the above technical solutions.

[0024] In some preferred embodiments, the cleaning composition can be used to clean silicone oil.

[0025] In some preferred embodiments, the cleaning composition may include, by weight: 5 to 25 parts (e.g., about 5 parts, about 8 parts, about 10 parts, about 12 parts, about 15 parts, about 18 parts, about 20 parts, about 22 parts, about 25 parts or any weight range) of the rhamnolipid composition, 0 to 3 parts (e.g., about 0.1 parts, about 0.2 parts, about 0.5 parts, about 0.8 parts, about 1 part, about 1.2 parts, about 1.5 parts, about The invention also provides the present invention with the following embodiments: the present invention comprises the following: a compounding agent of claim 1, wherein the compounding agent comprises: a compounding agent of claim 2, wherein the compounding agent comprises: a compounding agent of claim 1, wherein the compounding agent comprises: a compounding agent of claim 2 parts, about 2.5 parts, about 3 parts or any weight parts interval), a pH regulator of 2 to 10 parts (for example, it can be about 2 parts, about 3 parts, about 4 parts, about 5 parts, about 6 parts, about 7 parts, about 8 parts, about 9 parts, about 10 parts or any weight parts interval) and a sodium gluconate of 1 to 8 parts (for example, it can be about 1 part, about 2 parts, about 3 parts, about 4 parts, about 5 parts, about 6 parts, about 7 parts, about 8 parts or any weight parts interval).

[0026] In some more preferred embodiments, the cleaning agent composition may include, by weight: 5 to 10 parts of the rhamnolipid composition, 0.5 to 1.5 parts of a compounding agent, 2 to 8 parts of a pH regulator, and 2 to 6 parts of sodium gluconate.

[0027] The cleaning composition provided by the present invention may further include alkyl polymethylsiloxane or phenyl polymethylsiloxane. Such substances can further enhance the compatibility of rhamnolipid and silicone oil, thereby achieving a faster and more thorough cleaning purpose.

[0028] In some preferred embodiments, the cleaning composition may further include 0.1 to 2 parts (for example, about 0.1 parts, about 0.2 parts, about 0.3 parts, about 0.4 parts, about 0.5 parts, about 0.8 parts, about 1 parts, about 1.2 parts, about 1.5 parts, about 1.8 parts, about 2 parts or any range of parts by weight) of alkyl polymethylsiloxane.

[0029] In some preferred embodiments, the alkyl polymethylsiloxane can be selected from one or more of octyl polymethylsiloxane, dodecyl polymethylsiloxane, and hexadecyl polymethylsiloxane.

[0030] In some preferred embodiments, the compounding agent can be selected from one or more of sucrose esters, alkyl glycosides, coconut oil diethanolamide, polysorbate, fatty alcohol esters, and glyceryl monostearate. The compounding agent and rhamnolipid can further enhance the cleaning effect.

[0031] In some preferred embodiments, the pH adjuster can be selected from a mixture of 0.1 to 2 parts of citric acid and 2 to 8 parts of sodium citrate, for example, a mixture of 0.2 to 1 parts of citric acid and 3 to 6 parts of sodium citrate, by weight.

[0032] A fourth aspect of the present invention provides an industrial cleaning agent comprising 5 to 40 wt.% (e.g., about 5 wt.%, about 10 wt.%, about 15 wt.%, about 20 wt.%, about 25 wt.%, about 30 wt.%, about 35 wt.%, about 40 wt.%, or any weight percentage range) of the cleaning composition of any one of the above technical solutions and 60 to 95 wt.% of water.

[0033] In some preferred embodiments, the industrial cleaning agent can be used to clean silicone oil, for example, equipment or components such as tanks and pipelines containing silicone oil.

[0034] The industrial cleaning agent provided by the present invention can be prepared using a common preparation process in the art, for example, by adding the components to water in any order to achieve the desired weight percentage range.

[0035] The technical solution provided by the present invention has the following advantages:

[0036] (1) The rhamnolipid composition provided by the present invention can balance emulsification, wettability and foaming properties. On the basis of high emulsification, high wettability can enable the cleaning agent to quickly penetrate into the silicone oil contact surface and emulsify the oil, while low foaming is conducive to rapid cleaning. Therefore, the rhamnolipid composition of the present invention has strong cleaning ability and fast cleaning speed, and is therefore very suitable for cleaning and removing silicone oil in the industrial field.

[0037] (2) The rhamnolipid composition provided by the present invention has a simple preparation process, is inexpensive and readily available, and can produce a variety of products with different properties by adjusting the proportions of the components of the composition. It has a wide range of applications. Moreover, rhamnolipid is a biodegradable substance and is environmentally friendly.

[0038] (3) The industrial cleaning agent provided by the present invention has excellent silicone oil removal ability, and the oil removal efficiency can reach more than 95% or even higher. Therefore, it has very wide application potential in the field of industrial cleaning and is suitable for large-scale production and application. DETAILED DESCRIPTION

[0039] The technical solution of the present invention is further described in detail below with reference to specific embodiments.

[0040] Unless otherwise specified, the percentages used in the examples and comparative examples of the present invention are all percentages by mass.

[0041] The raw materials and reagents used in the examples and comparative examples of the present invention are shown in the following table. Other raw materials and reagents are commercially available unless otherwise specified.

[0042] Among them, rhamnolipid refers to the concentrated fermentation broth produced by Pseudomonas aeruginosa fermentation, and its preparation process is as follows:

[0043] Rhamnolipid fermentation broth: First, Pseudomonas aeruginosa is inoculated on a solid culture medium by the plate streak method to activate the strain; then, a single colony is picked from the activated strain and inoculated into a seed culture medium (composition includes: peptone 10.0 g / L, yeast powder 5.0 g / L, NaCl 10.0 g / L), and cultured at 30°C for 6 hours to obtain a seed liquid; then, the seed liquid is inoculated into a fermentation medium (composition includes: yeast extract 5 g / L, urea 5 g / L, sodium nitrate 10 g / L, Na2HPO4 4 g / L, KH2PO4 4 g / L, CaCl2 0.4 g / L, MgSO4 2 g / L) at an inoculum amount of 1-10 vol% to obtain a rhamnolipid fermentation broth.

[0044] Isolation and purification: The rhamnolipid fermentation broth was centrifuged at 6000 rpm for 15 minutes, the supernatant was collected, and 38 wt% concentrated hydrochloric acid was added thereto to adjust the pH to 1.5-2.0. The mixture was then allowed to stand in a refrigerator at 4°C for 24 hours and centrifuged again at 6000 rpm for 10 minutes to collect the precipitate. The precipitate was mixed with 3 volumes of methanol, filtered through a 30,000 Da ultrafiltration membrane, and the filtrate was collected. The methanol was then evaporated using a rotary evaporator at 70°C for 3 hours to obtain a paste. The paste was mixed with an equal volume of water, and the pH was adjusted to above 6.0 with 3M sodium hydroxide aqueous solution. The mixture was stirred and dissolved for 2 hours, pre-frozen at -80°C for 3 hours, and then freeze-dried in a freeze dryer at -86°C for 48 hours to obtain rhamnolipid.

[0045] By using the same method as above, fermentation broths with different compositions were obtained by adjusting the fermentation and separation and purification process parameters. The specific compositions (quantified by HPLC) are shown in the Examples and Comparative Examples.

[0046] Example 1

[0047] The composition of rhamnolipids is as follows:

[0048] The rhamnolipid of Example 1 was named "rhamnolipid-1", and rhamnolipid-1 was used to construct compositions of rhamnolipid and defoaming agent.

[0049] The formula of Example 1-1 is as follows:

[0050] The formula of Example 1-2 is as follows:

[0051] Example 2

[0052] The composition of rhamnolipids is as follows:

[0053] The rhamnolipid of Example 2 was named "rhamnolipid-2", and rhamnolipid-2 was used to construct the compositions of rhamnolipid and defoaming agent.

[0054] The formula of Example 2-1 is as follows:

[0055] The formula of Example 2-2 is as follows:

[0056] The formula of Example 2-3 is as follows:

[0057] Example 3

[0058] The composition of rhamnolipids is as follows:

[0059] The rhamnolipid of Example 3 was named "rhamnolipid-3", and rhamnolipid-3 was used to construct the compositions of rhamnolipid and defoaming agent.

[0060] The formula of Example 3-1 is as follows:

[0061] The formula of Example 3-2 is as follows:

[0062] Example 4

[0063] The composition of rhamnolipids is as follows:

[0064] The rhamnolipid of Example 4 was named "rhamnolipid-4", and rhamnolipid-4 was used to construct compositions of rhamnolipid and defoaming agent.

[0065] The formula of Example 4-1 is as follows:

[0066] The formula of Example 4-2 is as follows:

[0067] Comparative Example 1

[0068] The composition of rhamnolipids is as follows:

[0069] The rhamnolipid of Comparative Example 1 was named "Rhamnolipid-Comparative 1", and rhamnolipid-Comparative 1 was used to construct compositions of rhamnolipid and defoaming agent.

[0070] The formula of Comparative Example 1-1 is as follows:

[0071] The formula of Comparative Example 1-2 is as follows:

[0072] Comparative Example 2

[0073] The composition of rhamnolipids is as follows:

[0074] The rhamnolipid of Comparative Example 2 was named "Rhamnolipid-Comparative 2", and rhamnolipid-Comparative 2 was used to construct compositions of rhamnolipid and defoaming agent.

[0075] The formula of Comparative Example 2-1 is as follows:

[0076] The formula of Comparative Example 2-2 is as follows:

[0077] Comparative Example 3

[0078] Commercially available surfactant AEO9 was used.

[0079] Test Example 1 Foam Performance Test

[0080] The foam performance was measured using a Roche foam tester according to the foaming force determination method in standard GB / T 13173-2021.

[0081] A Roche foam meter was used to measure the foaming power of a sample with an effective rhamnolipid content of 2.5 g / L in 150 mg / kg hard water. The foam height of the sample was measured at 0 min. The test temperature was 40°C. The sample was measured three times and the average value was taken. The test data are shown in Tables 1-1 and 1-2:

[0082] Table 1-1 Foaming test results of rhamnolipids in Example

[0083] Table 1-2 Foaming test results of rhamnolipids in comparative examples

[0084] Test Example 2 Wetting Performance Test

[0085] The contact angle method was used to measure the wettability of different samples. A 1 wt.% rhamnolipid (a composition of rhamnolipid and defoaming agent, calculated based on the rhamnolipid content) aqueous solution was prepared. At 25°C, silicone oil (DOW CORNING 705) was used as the contact surface. The contact angle of the rhamnolipid was measured using a contact angle meter. Each sample was measured three times and the average value was taken. The test data are shown in Tables 2-1 and 2-2:

[0086] Table 2-1 Contact angle test results of rhamnolipids in Example

[0087] Table 2-2 Contact angle test results of rhamnolipid of comparative example

[0088] Comprehensive foaming and wetting performance test results show that, given the same composition, higher defoamer content results in lower foam height, easier cleaning, smaller contact angles, and easier spreading. Higher RhaRha-C10C10 content also results in higher foam height, making cleaning more difficult, and larger contact angles, making spreading less likely. AEO9 has lower foaming properties, but a larger contact angle makes it difficult to spread on silicone oil surfaces.

[0089] Test Example 3: Degreasing Test

[0090] Rhamnolipid (a combination of rhamnolipid and a defoaming agent) was prepared into an industrial cleaning agent, and its ability to remove silicone oil was evaluated.

[0091] The cleaning agent comprises, by weight, 6 parts of effective rhamnolipid content (calculated as rhamnolipid content), 0 parts or 0.5 parts of octyl polymethylsiloxane, 1 part of alkyl glycoside, 0.5 parts of citric acid, 4 parts of sodium citrate, 3 parts of sodium gluconate, and 100 parts of water.

[0092] The cleaning agent of Comparative Example 3 comprises, by weight: 7 parts of AEO9 surfactant, 1 part of alkyl glycoside, 0.5 parts of citric acid, 4 parts of sodium citrate, 3 parts of sodium gluconate, and 100 parts of water.

[0093] A degreasing and cleaning test was conducted on the surface of the same stainless steel sheet. The test process involved applying oil (a mixture of silicone oil and dust, with the silicone oil source being the same as in Test Example 2) to the surface of the stainless steel sheet. After cleaning with a sufficient amount of the aforementioned cleaning agent, the sheet was rinsed with clean water and dried. The test results are shown in Tables 3-1 and 3-2. Removal rate (%) = (AB) / A × 100 (A is the total weight of contaminants attached before cleaning, and B is the weight of contaminants attached after cleaning. The contaminant weight is calculated by subtracting the weight of the clean, dry stainless steel sheet from the total weight, with the difference in contaminant weight between tests not exceeding 5%).

[0094] Table 3-1 Degreasing test results (0.5 parts of octyl polymethylsiloxane)

[0095] Table 3-2 Degreasing test results (0 parts of octyl polymethylsiloxane)

[0096] The results in Table 3 show that the rhamnolipid composition of the present invention, when used as a surfactant, has better cleaning ability than AEO9; it is also found that Example 2-1 has the highest cleaning ability. Combined with the composition of the composition, it can be analyzed that cleaning silicone oil stains requires good cleaning power, permeability, and low foaming. When the RhaRha-C10C10 type content is too high, the emulsification ability is strong but the permeability is insufficient. When the Rha-C10C10 type content is too high, the permeability is strong but the emulsification power is insufficient. Only when the content of the two components is within a certain range, the optimal permeability and removal ability for oil stains are achieved, and the silicone oil removal ability can be greater than 95%. At the same time, rhamnolipid itself is a medium-foaming surfactant. If a defoamer is not added (as shown in Example 2-3), the foam is slowly eliminated and the oil stain removal effect is also affected. Therefore, a certain amount of defoamer needs to be added to reduce the foaming performance. However, when the defoamer content is high (as shown in Example 4-2), the micelle size is increased, which in turn reduces the permeability to oil.

[0097] A small amount of octyl polymethylsiloxane is preferably added to the formula system of the cleaning agent, which can further increase the compatibility between the surfactant and the silicone oil, and has better compatibility and permeability to the silicone oil. During cleaning, the cleaning agent components can form micelles with a diameter of 50-100nm with the silicone oil, which are easy to remove. When the micelle diameter is too large or too small, the cleaning effect will be affected.

[0098] Unless otherwise defined, the terms used in the present invention have the same meanings as those commonly understood by those skilled in the art.

[0099] The embodiments described in the present invention are for illustrative purposes only and are not intended to limit the scope of protection of the present invention. Those skilled in the art may make various other substitutions, changes and improvements within the scope of the present invention. Therefore, the present invention is not limited to the above-mentioned embodiments, but is only limited by the claims.

Claims

1. A rhamnolipid composition for cleaning silicone oil, characterized in that: By weight, it comprises 10 to 50 parts of Rha-C10C10 rhamnolipid and 35 to 85 parts of RhaRha-C10C10 rhamnolipid.

2. The rhamnolipid composition according to claim 1, characterized in that In parts by weight, the rhamnolipid composition comprises 20 to 40 parts of Rha-C10C10 type rhamnolipid and 40 to 60 parts of RhaRha-C10C10 type rhamnolipid.

3. The rhamnolipid composition according to claim 1 or 2, characterized in that In parts by weight, the rhamnolipid composition further includes one or more of the following rhamnolipid types: 0.1 to 10 parts of RhaRha-C8C10 type, 0.1 to 2 parts of Rha-C8C10 type, 0.5 to 20 parts of RhaRha-C10C12 type, 0.1 to 10 parts of RhaRha-C10C12:1 type, 0.1 to 5 parts of Rha-C10C12 type, and 0.1 to 5 parts of Rha-C10C12:1 type; Preferably, the rhamnolipid composition further comprises one or more of the following rhamnolipid types, by weight: 0.2 to 5 parts of RhaRha-C8C10 type, 0.3 to 1 parts of Rha-C8C10 type, 5 to 10 parts of RhaRha-C10C12 type, 0.2 to 5 parts of RhaRha-C10C12:1 type, 0.2 to 2.5 parts of Rha-C10C12 type, and 0.2 to 2.5 parts of Rha-C10C12:1 type; More preferably, the rhamnolipid composition is a concentrated fermentation broth produced by fermentation of Pseudomonas aeruginosa.

4. The rhamnolipid composition according to any one of claims 1 to 3, characterized in that The rhamnolipid composition also includes a defoaming agent; Preferably, the defoaming agent is selected from one or more of emulsified silicone oil, polyoxyethylene polyoxypropylene pentaerythritol ether, polyoxyethylene polyoxypropanolamine ether, polyoxypropylene glycerol ether, polyoxypropylene oxyethylene glycerol ether, polydimethylsiloxane, sorbitol, higher fatty acid defoaming agent, and food defoaming agent; Preferably, the amount of the defoaming agent used is 0.1-10 wt.% of the total weight of all rhamnolipid types, more preferably 1-5 wt.%.

5. Use of the rhamnolipid composition according to any one of claims 1 to 4 in the preparation of a cleaning agent; preferably, the cleaning agent is an industrial cleaning agent for cleaning silicone oil.

6. A cleaning agent composition, characterized in that The rhamnolipid composition comprises the rhamnolipid composition according to any one of claims 1 to 4; preferably, the cleaning agent composition is used for cleaning silicone oil.

7. The cleaning composition according to claim 6, characterized in that In parts by weight, the cleaning agent composition comprises: 5 to 25 parts of the rhamnolipid composition, 0 to 3 parts of a compounding agent, 2 to 10 parts of a pH adjusting agent and 1 to 8 parts of sodium gluconate; preferably comprises: 5 to 10 parts of the rhamnolipid composition, 0.5 to 1.5 parts of a compounding agent, 2 to 8 parts of a pH adjusting agent and 2 to 6 parts of sodium gluconate.

8. The cleaning composition according to claim 7, characterized in that The cleaning agent composition further comprises, by weight: 0.1 to 2 parts of alkyl polymethylsiloxane or phenyl polymethylsiloxane; Preferably, the alkyl polymethylsiloxane is selected from one or more of octyl polymethylsiloxane, dodecyl polymethylsiloxane and hexadecyl polymethylsiloxane.

9. The cleaning composition according to claim 7, characterized in that The compounding agent is selected from one or more of sucrose esters, alkyl glycosides, coconut oil diethanolamide, polysorbate, fatty alcohol esters, and glyceryl monostearate; In parts by weight, the pH regulator is selected from a mixture of 0.1 to 2 parts of citric acid and 2 to 8 parts of sodium citrate; preferably selected from a mixture of 0.2 to 1 parts of citric acid and 3 to 6 parts of sodium citrate.

10. An industrial cleaning agent, characterized in that: The industrial cleaning agent comprises 5-40 wt. % of the cleaning agent composition according to any one of claims 6-9 and 60-95 wt. % of water; preferably, the industrial cleaning agent is used for cleaning silicone oil.

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