A synthetic ester type biodegradable hydraulic oil composition

Abstract

The present invention discloses a synthetic ester type biodegradable hydraulic oil composition, which is composed of the following components in weight percentages: compound additive: 0.5 - 5%; demulsifier: 0.001 - 0.01%; antifoaming agent: 0.001 - 0.01%; rust inhibitor 0 - 0.1%; ester base oil: the balance; wherein, the compound additive is one of compound additive A, compound additive B, and compound additive C; the ester base oil is one or two or three of polyol ester, dibasic acid ester, or fatty acid ester. The present invention also provides a preparation method of the hydraulic oil composition. The advantages of the hydraulic oil composition prepared by the present invention are: having good anti-wear property, viscosity-temperature property, antioxidant property, and also having outstanding biodegradation rate and excellent pour point.

Description

Technical Field

[0001] The present invention relates to the technical field of lubricating oils. Specifically, the present invention relates to a high-performance synthetic ester type biodegradable hydraulic oil composition and a preparation method thereof. Background Art

[0002] The environment is the basis for the survival of humans and other life forms. With the continuous improvement of the public's awareness of environmental protection and the increasing attention of the international community to the ecological environment, the environmental pollution problems caused by lubricating oils have attracted more and more attention. Countries around the world (especially industrialized countries) have strengthened the management of the use of lubricating oils, especially formulating strict environmental protection regulations for the disposal of waste oils. Although lubrication technology is constantly advancing, it is still impossible to avoid various environmental pollutions caused by lubricating oils, such as ruptured injection pipes, oil spills during canning, splashing during use, etc. This has promoted lubricating oil manufacturers to develop lubricating oils that meet environmental protection requirements, that is, biodegradable green lubricating oils.

[0003] Biodegradable hydraulic oil refers to an oil product that not only must meet the performance requirements of a hydraulic system during use, but also requires that itself and its consumption products do not cause harm to the ecosystem, that is, it has characteristics such as biodegradability, low ecological toxicity, and low consumption. Based on the above performance requirements, currently, biodegradable base oils such as vegetable oils, ester oils, and polyethylene glycols are mainly used in the development of biodegradable hydraulic oils; although the above base oils have relatively good biodegradability, some of them also have some deficiencies, such as insufficient oxidation stability and hydrolysis stability, and greater damage to rubber parts. Moreover, with the progress and development of hydraulic technology, more hydraulic components are widely used in various environments. Therefore, for biodegradable products, it is not only necessary to solve the problem of biodegradability of biodegradable hydraulic oils in the traditional sense, but also to take into account their pour points and antioxidant properties, so that they can adapt to a natural environment with a greater temperature change. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems in the related technologies. For this reason, the present invention provides a high-performance synthetic ester type biodegradable hydraulic oil composition and a preparation method thereof. The hydraulic oil composition of the present invention has excellent biodegradability and antioxidant properties, as well as a lower pour point, and can be applied to more severe low-temperature environments.

[0005] The technical solution adopted by the present invention is as follows:

[0006] An embodiment of the present invention provides a hydraulic oil composition, which is composed of the following components in weight percentages,

[0007] Compound additive: 0.5 - 5%; Demulsifier: 0.001 - 0.01%; Antifoaming agent: 0.001 - 0.01%; Rust inhibitor 0 - 0.1%: Ester base oil: the balance; wherein,

[0008] The compound additive is one of compound additive A, compound additive B, and compound additive C; the compound additive A is HiTEC 544, the compound additive B is LUBRIZOL 5686EL, and the compound additive C is IRGANOXML 811;

[0009] The ester base oil is one or two or three of polyol ester, dibasic acid ester or fatty acid ester.

[0010] Preferably, the ester base oil is a composition of BASF ES2813 and BASF ES 3345. More preferably, the ester base oil is a composition of BASF ES2813 and BASF ES 3345 with a mass ratio of 1:(0.9 - 1.1).

[0011] Preferably, the compound additive is compound additive B. Preferably, the dosage of the compound additive is 0.5 - 1.5%.

[0012] In some embodiments, the rust inhibitor is dodecenyl succinic acid half ester or carboxylic acid imidazoline derivative. Preferably, the dosage of the rust inhibitor is 0.01 - 0.1%.

[0013] In some embodiments, the demulsifier is one of an ether polymer compound, an amine and ethylene oxide condensate, or a propylene oxide / ethylene oxide block copolymer.

[0014] In some embodiments, the antifoaming agent is polydimethylsiloxane, or a composite antifoaming agent of silicon type and non-silicon type.

[0015] The hydraulic oil composition prepared in the embodiments of the present invention has a kinematic viscosity at 40°C of 41.4 - 50.6 mm 2 / s, a biodegradation rate > 80%, and a pour point < -54°C.

[0016] The present invention also provides a preparation method of the above hydraulic oil composition, including the following steps:

[0017] According to the weight percentage, add the ester base oil into a reaction kettle, add the compound additive, the rust inhibitor, and the demulsifier, heat up to 55 - 65°C and stir for 1 - 2 hours; when the temperature drops to 40 - 50°C, add the antifoaming agent, stir evenly, and filter through a filter screen to obtain.

[0018] Advantages of the present invention:

[0019] (1) The hydraulic oil composition prepared by the present invention has good anti-wear property, viscosity-temperature property, oxidation resistance, and also has outstanding biodegradability and excellent pour point. After testing, the pour point data reaches about -63°C, and the biodegradability reaches more than 80%. It can adapt to a natural environment with a larger temperature change, and is especially suitable for extremely cold regions sensitive to the environment.

[0020] (2) The hydraulic oil composition prepared by the present invention has a kinematic viscosity at 40°C within the range of 41.4 - 50.6, which meets the kinematic viscosity range of conventional biodegradable hydraulic oils. Detailed Embodiments

[0021] The embodiments of the present invention will be described in detail below. The following described embodiments are exemplary and are intended to explain the present invention, and should not be construed as a limitation to the present invention.

[0022] In this article, unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field of the present application.

[0023] When values are described as ranges, it should be understood that such disclosure includes the disclosure of all possible sub-ranges within the range, as well as specific numerical values falling within the range, regardless of whether specific numerical values or specific sub-ranges are explicitly indicated.

[0024] The embodiments of the present invention provide a hydraulic oil composition, which is composed of the following components in weight percentages,

[0025] Compound additive: 0.5 - 5%; Demulsifier: 0.001 - 0.01%; Antifoaming agent: 0.001 - 0.01%; Rust inhibitor 0 - 0.1%: Ester base oil: the balance; wherein,

[0026] The compound additive is one of compound additive A, compound additive B, and compound additive C; the compound additive A is HiTEC 544 (Afton), the compound additive B is LUBRIZOL 5686EL (Lubrizol), and the compound additive C is IRGANOX ML 811 (BASF);

[0027] The ester base oil is one or two or three of polyol esters, dibasic acid esters, or fatty acid esters.

[0028] Non-limiting examples are as follows. In the hydraulic oil composition, the compound additive can be 0.5%, 1%, 1.5%, 2.5%, 5%, etc.; the demulsifier can be 0.001%, 0.003%, 0.005%, 0.008%, 0.01%, etc., the antifoaming agent can be 0.001%, 0.003%, 0.005%, 0.008%, 0.01%, etc., the rust inhibitor can be 0.001%, 0.01%, 0.05%, 0.08%, 0.1%, etc., and the ester base oil: the balance.

[0029] Preferably, the ester base oil is a composition of BASF ES2813 and BASF ES 3345. More preferably, the ester base oil is a composition of BASF ES2813 and BASF ES 3345 with a mass ratio of 1:(0.9 - 1.1). Non-limiting examples are as follows: the mass ratio can be 1:0.9, 1:0.95, 1:1, 1:1.05, 1:1.1, etc.

[0030] Preferably, the compound additive is compound additive B. Preferably, the dosage of the compound additive is 0.5 - 1.5%. Non-limiting examples are as follows: the dosage of the compound additive can be 0.5%, 0.6%, 0.7%, 0.8%, 1%, 1.2%, 1.5%, etc.

[0031] In some embodiments, the rust inhibitor is dodecenyl succinic acid half ester or carboxylic acid imidazoline derivative. Preferably, the dosage of the rust inhibitor is 0.01 - 0.1%. Non-limiting examples are as follows: the dosage of the rust inhibitor can be 0.01%, 0.05%, 0.08%, 0.1%, etc.

[0032] In some embodiments, the demulsifier is one of an ether polymer compound, an amine and ethylene oxide condensate, or a propylene oxide / ethylene oxide block copolymer.

[0033] In some embodiments, the antifoaming agent is polydimethylsiloxane or a composite antifoaming agent of silicon type and non-silicon type.

[0034] The kinematic viscosity of the hydraulic oil composition prepared in the embodiment of the present invention at 40 °C is 41.4 - 50.6 mm 2 / s, the biodegradation rate > 80%, and the pour point < -54 °C.

[0035] The present invention also provides a preparation method of the above hydraulic oil composition, including the following steps:

[0036] According to the weight percentage, add ester base oil into the reaction kettle, add compound additives, rust inhibitors, demulsifiers, heat up to 55 - 65 °C and stir for 1 - 2 hours; when the temperature drops to 40 - 50 °C, add antifoaming agents, stir evenly, and filter through a filter screen to obtain the product.

[0037] It should be noted that:

[0038] Unless otherwise specified, the raw materials and reagents used in the following examples are all commercially available products, or can be prepared by known methods.

[0039] The schemes of the following comparative examples are not prior art, but are only set for comparison with the schemes of the examples and do not constitute a limitation to the present invention.

[0040] Sources of reagents for examples and comparative examples:

[0041] Compound additive A: HiTEC 544, purchased from: Afton Chemical (Suzhou) Co., Ltd.;

[0042] Compound additive B: LUBRIZOL 5686EL, purchased from: Lubrizol Additives (Zhuhai) Co., Ltd.;

[0043] Compound additive C: IRGANOX ML 811, purchased from: Qingdao Derunkai Chemical Co., Ltd.;

[0044] Demulsifier: DL - 32 polyether polymer compound, purchased from: Jinzhou Xinxing Petroleum Additive Co., Ltd.;

[0045] Compound antifoaming agent: Kunlun No. 1 compound antifoaming agent, purchased from: Beijing Yilinail Petroleum Chemical Co., Ltd.;

[0046] Rust inhibitor: BASF IRGACOR L 12; purchased from: Qingdao Derunkai Chemical Co., Ltd.

[0047] Example 1

[0048] A synthetic ester - type biodegradable hydraulic oil composition is composed of the following components in parts by weight: BASF ES2813 (adipic acid diester base oil): 50.2 parts, BASF ES 3345 (fatty acid ester base oil): 48.97 parts, compound additive A: 0.82 parts, demulsifier ether polymer compound: 0.005 parts, compound antifoaming agent: 0.005 parts.

[0049] Preparation method, including the following steps: Add the base oils (BASF ES2813, BASF ES 3345) into a reaction kettle, start stirring, add compound additive A and demulsifier, heat up to 60 °C and stir for 1.5 hours. When the temperature drops to 45 °C, add the antifoaming agent, stir evenly, and filter through a filter screen to obtain the product.

[0050] Example 2

[0051] A synthetic ester type biodegradable hydraulic oil composition is composed of the following components in parts by weight,

[0052] BASF ES2813 (adipic acid diester base oil): 49.5 parts, BASF ES 3345 (fatty acid ester base oil): 49.24 parts, compound additive B: 1.25 parts, demulsifier ether polymer compound: 0.005 parts, compound antifoaming agent: 0.005 parts.

[0053] Preparation method, including the following steps: Add the base oils (BASF ES2813, BASF ES 3345) into a reaction kettle, start stirring, add compound additive B and demulsifier, heat up to 60 °C and stir for 1.5 hours. When the temperature drops to 45 °C, add the antifoaming agent, stir evenly, and filter through a filter screen to obtain the product.

[0054] Example 3

[0055] A synthetic ester type biodegradable hydraulic oil composition is composed of the following components in parts by weight, BASF ES2813 (adipic acid diester base oil): 49.5 parts, BASF ES 3345 (fatty acid ester base oil): 49.57 parts, compound additive C: 0.9 parts, rust inhibitor dodecenyl succinic acid half ester: 0.02 parts, demulsifier ether polymer compound: 0.005 parts, compound antifoaming agent: 0.005 parts.

[0056] Preparation method, including the following steps: Add the base oils (BASF ES2813, BASF ES 3345) into a reaction kettle, start stirring, add compound additive C, rust inhibitor and demulsifier, heat up to 60 °C and stir for 1.5 hours. When the temperature drops to 45 °C, add the antifoaming agent, stir evenly, and filter through a filter screen to obtain the product.

[0057] Comparative Example 1

[0058] A synthetic ester type biodegradable hydraulic oil composition is composed of the following components in parts by weight, BASF TMP 05 (natural oleic acid ester base oil): 98.74 parts, compound additive B: 1.25 parts, demulsifier ether polymer compound: 0.005 parts, compound antifoaming agent: 0.005 parts.

[0059] Preparation method, comprising the following steps: adding base oil (BASF TMP 05) into a reaction kettle, starting stirring, adding compound additive B and demulsifier, heating to 60 °C and stirring for 1.5 hours, adding antifoaming agent when the temperature drops to 45 °C, stirring evenly, and filtering through a filter screen to obtain the product.

[0060] Comparative Example 2

[0061] A synthetic ester type biodegradable hydraulic oil composition is composed of the following components in parts by weight: Shandong Ruijie RJ-1453 (trimethylolpropane oleate base oil): 98.74 parts, compound additive B: 1.25 parts, demulsifier ether polymer compound: 0.005 parts, composite antifoaming agent: 0.005 parts.

[0062] Preparation method, comprising the following steps: adding base oil (Shandong Ruijie RJ-1453) into a reaction kettle, starting stirring, adding compound additive B and demulsifier, heating to 60 °C and stirring for 1.5 hours, adding antifoaming agent when the temperature drops to 45 °C, stirring evenly, and filtering through a filter screen to obtain the product.

[0063] Comparative Example 3

[0064] A synthetic ester type biodegradable hydraulic oil composition is composed of the following components in parts by weight: Shandong Ruijie RJ-1426 (dipentaerythritol ester base oil): 73 parts, Shandong Ruijie RJ-1903 (diester base oil): 25.74 parts, compound additive B: 1.25 parts, demulsifier ether polymer compound: 0.005 parts, composite antifoaming agent: 0.005 parts.

[0065] Preparation method, comprising the following steps: adding base oil (Shandong Ruijie RJ-1426, Shandong Ruijie RJ-1903) into a reaction kettle, starting stirring, adding compound additive B and demulsifier, heating to 60 °C and stirring for 1.5 hours, adding antifoaming agent when the temperature drops to 45 °C, stirring evenly, and filtering through a filter screen to obtain the product.

[0066] Performance tests were carried out on the hydraulic oil compositions prepared in Examples 1-3 and Comparative Examples 1-3, and the results are shown in Table 1.

[0067] Table 1 Comparison of product performances of Examples 1-3 and Comparative Examples 1-3

[0068]

[0069] Table 1 shows the biodegradability, pour point, rotary oxygen bomb and other data of Examples 1-3 and Comparative Examples 1-3. Through the comparison of the above data, the biodegradability of this application is on par with that of Comparative Examples 1-2, higher than that of Comparative Example 3, and the pour point and antioxidant performance are significantly better than those of Comparative Examples 1-3. Among Examples 1-3, the effect of Example 2 is better. It can be seen that when the composite additive B in the hydraulic oil composition of the present invention is paired with the saturated ester base oils BASF ES2813 and BASF ES 3345, whether it is in terms of the sensitivity of the base oil to the additive or the synergy between the two, its effect is much higher than the combination of unsaturated ester base oil and composite additive B, and the combination of saturated ester base oil and composite additive A or C. The saturated ester base oil provides a very high degradation rate for the composition, making the degradation rate of the composition reach more than 80%. The composite additive B strengthens the anti-wear property of the saturated ester base oil, enabling the product to pass the relatively strict test such as Denison T6H20C and having excellent anti-wear ability. Moreover, the antioxidant performance of the composition is also particularly outstanding, improving the service life of the oil product and reducing the number of oil changes. At the same time, the good compatibility of the two with one or several adjuvants also provides the product with a very low pour point, as well as good anti-foaming and demulsification properties. Finally, through experimental tests, the hydraulic oil composition of the present invention has good compatibility with ordinary mineral oils and can achieve the result of perfect replacement with ordinary mineral oils.

[0070] In the present invention, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0071] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limitations of the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A hydraulic oil composition, characterized in that: It is composed of the following components in percentage by weight: Composite additives: 0.5~5%; Demulsifier: 0.001~0.01%; Antifoaming agent: 0.001~0.01%; rust inhibitor 0~0.1%; ester base oil: balance; of which, The composite additive is composite additive B, and the composite additive B is LUBRIZOL 5686EL; The ester base oil is a combination of BASF ES 2813 and BASF ES 3345.

2. A hydraulic oil composition according to claim 1, characterized in that: The ester base oil is a composition of BASF ES2813 and BASF ES 3345 in a mass ratio of 1: (0.9-1.1).

3. The hydraulic oil composition according to claim 1, characterized in that: The dosage of the composite additive is 0.5-1.5%.

4. The hydraulic oil composition according to claim 1, characterized in that: The rust inhibitor is dodecenylsuccinic acid half ester or carboxylic acid imidazoline derivative, and the dosage of the rust inhibitor is 0.01-0.1%.

5. The hydraulic oil composition according to claim 1, characterized in that: The demulsifier is one of ether polymer compounds, amine and ethylene oxide condensate or propylene oxide / ethylene oxide block copolymer.

6. The hydraulic oil composition according to claim 1, characterized in that: The anti-foaming agent is polymethyl silicone oil, or a silicon-type and non-silicon-type composite anti-foaming agent.

7. The hydraulic oil composition according to claim 1, characterized in that: The kinematic viscosity of the hydraulic oil composition at 40° C. is 41.4 to 50.6 mm 2 / s, biodegradation rate>80%, pour point<-54℃.

8. A hydraulic oil composition according to any one of claims 1 to 7, characterized in that: The preparation method of the hydraulic oil composition comprises the following steps: adding the ester base oil into a reaction kettle according to weight percentage, adding the composite additive, the rust inhibitor, and the demulsifier, heating to 55-65° C. and stirring for 1-2 hours; adding the antifoaming agent when the temperature drops to 40-50° C., stirring evenly, and filtering through a filter to obtain the hydraulic oil composition.

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