Silicon steel rust preventive oil and preparation method thereof

Abstract

The application belongs to the technical field of rust-proof oil, and discloses a silicon steel rust-proof oil and a preparation method thereof.The silicon steel rust-proof oil comprises the following raw materials in parts by weight: base oil 72-80 parts, rust-proof agent 15-25 parts, surfactant 0.5-2 parts and antioxidant 0.1-1 part; the rust-proof agent comprises calcium petroleum sulfonate and sodium petroleum sulfonate, and the weight ratio of the calcium petroleum sulfonate to the sodium petroleum sulfonate is (1-2):1.The application proposes a specific rust-proof agent composition in a rust-proof oil system, so that a strong physical adsorption effect on the surface of silicon steel is achieved, the rust-proof performance on the silicon steel is well ensured, and the rust-proof oil has the characteristics of low odor and environmental protection, and can be applied to the field of silicon steel rust-proof.

Description

Technical Field

[0001] This invention belongs to the field of rust-preventive oil technology, and specifically relates to a silicon steel rust-preventive oil and its preparation method. Background Technology

[0002] Silicon steel, due to its high magnetic permeability, low coercivity, and high resistivity, is widely used in power, electronics, and military industries. Rust prevention technology for silicon steel is crucial for ensuring the long-term stability and energy efficiency reliability of related equipment in these applications. Currently, most commercially available rust-preventive oils are designed for carbon steel or low-alloy steel and cannot effectively form strong adhesion to silicon steel surfaces. The coating formed on silicon steel surfaces is often uneven, especially in humid or harsh environments, where the rust-preventive oil easily runs off or peels off locally, resulting in unsatisfactory rust prevention. Using high-viscosity base oils to enhance the adhesion between the rust-preventive oil and the silicon steel surface leads to a thicker oil film. An excessively thick oil film increases the electromagnetic losses of silicon steel, affecting its energy efficiency reliability. Therefore, the development of rust-preventive oils specifically for silicon steel has become one of the problems that the silicon steel industry needs to solve. Summary of the Invention

[0003] The present invention aims to improve at least one technical problem in the prior art.

[0004] On one hand, the present invention provides a silicon steel rust-preventive oil, comprising the following raw materials in parts by weight: 72-80 parts base oil, 15-25 parts rust inhibitor, 0.5-2 parts surfactant and 0.1-1 parts antioxidant; the rust inhibitor comprises calcium petroleum sulfonate and sodium petroleum sulfonate, wherein the weight ratio of calcium petroleum sulfonate to sodium petroleum sulfonate is (1-2):1.

[0005] This invention fully considers the surface chemical properties of silicon steel. The rust remover uses calcium petroleum sulfonate and sodium petroleum sulfonate in a specific ratio to form a strong physical adsorption with the surface of silicon steel, ensuring the rust-preventive effect of the rust-preventive oil when applied to silicon steel.

[0006] Preferably, the base value of calcium petroleum sulfonate is >295mg KOH / g, and the calcium content of calcium petroleum sulfonate is ≥11.6%, so as to ensure the excellent salt spray rust prevention performance of the rust inhibitor.

[0007] Preferably, the sodium sulfonate content is ≥65%, and the molecular weight of the sodium sulfonate is 500g / mol-530g / mol, to ensure the rust-preventive performance of the rust inhibitor.

[0008] Preferably, the rust inhibitor also includes a calcium-based composite agent, which is composed of calcium dinonylnaphthalenesulfonate and a carboxylate. The calcium content in the calcium-based composite agent is 1.5%, and the acid value is 90 mg KOH / g. The nonyl structure of the calcium dinonylnaphthalenesulfonate has 6 branches, which has strong dehydration properties and can further enhance the rust prevention ability of the rust inhibitor.

[0009] Preferably, the rust inhibitor also includes at least one of zinc naphthenate or N-oleoylsarcosine-octadecylamine salt.

[0010] Preferably, the calcium-based complex is present in 3-4 parts by weight, and the N-oleoylsarcosine-octadecylamine salt is present in 1-2 parts by weight.

[0011] Preferably, the base oil is an isomeric solvent oil.

[0012] Isomerizing solvent oil is a high-purity solvent oil obtained through an isomerization process. The addition of isomerizing solvent oil in this invention enables the silicon steel rust-preventive oil to possess relatively better chemical stability and excellent low-temperature fluidity (making it less prone to solidification in low-temperature environments). Furthermore, it can more effectively dissolve various organic compounds, such as some additives / auxiliaries in the rust-preventive oil field, thereby improving the uniformity and gloss of the silicon steel rust-preventive oil. Using isomerizing solvent oil as a base oil allows the silicon steel rust-preventive oil to form a thinner oil film, avoiding excessively thick oil films that increase the electromagnetic loss of silicon steel. Moreover, further screening for barium-free rust inhibitors combined with isomerizing solvent oil also gives the silicon steel rust-preventive oil of this invention a low-odor characteristic, thus reducing irritation and discomfort for operators during industrial use. In addition, it has the advantages of being environmentally friendly, low-toxicity, and having minimal harm to the human body, complying with numerous global environmental regulations.

[0013] Preferably, the surfactant is a dehydrated sorbitan fatty acid ester.

[0014] More preferably, the surfactant is Span-80 sorbitan monooleate.

[0015] Preferably, the antioxidant is 2,6-di-tert-butyl-p-cresol.

[0016] On the other hand, the present invention also provides a method for preparing the above-mentioned silicon steel anti-rust oil, comprising the following steps:

[0017] Under conditions of 45℃-55℃, the base oil and the rust inhibitor are mixed evenly, and then the surfactant and the antioxidant are added and mixed evenly to obtain the silicon steel rust-preventive oil.

[0018] Beneficial effects: This invention proposes a specific rust inhibitor composition in the rust-preventive oil system, thereby achieving a strong physical adsorption effect on the surface of silicon steel, which effectively ensures the rust prevention performance on silicon steel. At the same time, it has the characteristics of low odor and environmental protection, and can be promoted and applied in the field of silicon steel rust prevention. Detailed Implementation

[0019] The present invention will be further described below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be understood that after reading the description of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined by the appended claims.

[0020] The reagents / raw materials involved in the examples and comparative examples include:

[0021] Heterogeneous Solvent Oil IP70: Beijing Beiran Industrial Group Co., Ltd.

[0022] Calcium petroleum sulfonate: Jinzhou Xinxing Petroleum Additives Co., Ltd.

[0023] N-Oleylsarcosine-Octylamine Salt T711: Jinzhou Xinxing Petroleum Additives Co., Ltd.

[0024] Calcium-based compound CA-1295: King's Industries

[0025] Sodium petroleum sulfonate: Anhui Chengtian Chemical Technology Co., Ltd.

[0026] Zinc naphthenate: Nanjing Tianhong Chemical Co., Ltd.

[0027] Span-80 (Sorbitol Monooleate): Nanjing Tianhong Chemical Co., Ltd.

[0028] 2,6-Di-tert-butyl-p-cresol: Tianjin Yitaicheng Chemical Technology Co., Ltd.

[0029] Example 1

[0030] A rust-preventive oil for silicon steel comprises the following raw materials in parts by weight: 73.9 parts of isomeric solvent oil IP70, 9 parts of calcium petroleum sulfonate, 9 parts of sodium petroleum sulfonate, 4 parts of calcium-based composite agent CA-1295, 2 parts of zinc naphthenate, 1 part of N-oleoylsarcosine-octadecylamine salt T7111, 1 part of sorbitan monooleate Span-80, and 0.1 parts of 2,6-di-tert-butyl-p-cresol.

[0031] The preparation method of the silicon steel rust-preventive oil in Example 1 is as follows:

[0032] 73.9 parts by weight of the isomeric solvent oil IP70 was added to a clean beaker and stirred at 50°C for 15 min to obtain liquid A;

[0033] Slowly add 9 parts by weight of calcium petroleum sulfonate, 9 parts by weight of sodium petroleum sulfonate, 4 parts by weight of calcium-based composite agent CA-1295, 2 parts by weight of zinc naphthenate, and 1 part by weight of N-oleoylsarcosine-octadecylamine salt T711 to liquid A, and stir at 50°C for 30 min to obtain mixed liquid B.

[0034] Slowly add 1 part by weight of sorbitan monooleate Span-80 and 0.1 part by weight of 2,6-di-tert-butyl-p-cresol to mixed liquid B, and stir at 50°C for 10 min to obtain silicon steel rust-preventive oil.

[0035] Example 2

[0036] A rust-preventive oil for silicon steel comprises the following raw materials in parts by weight: 73.9 parts of isomeric solvent oil IP70, 12 parts of calcium petroleum sulfonate, 6 parts of sodium petroleum sulfonate, 4 parts of calcium-based composite agent CA-1295, 2 parts of zinc naphthenate, 1 part of N-oleoylsarcosine-octadecylamine salt T711, 1 part of sorbitan monooleate Span-80, and 0.1 parts of 2,6-di-tert-butyl-p-cresol.

[0037] The preparation method of the silicon steel rust-preventive oil in Example 2 is as follows:

[0038] 73.9 parts by weight of the isomeric solvent oil IP70 was added to a clean beaker and stirred at 50°C for 15 min to obtain liquid A;

[0039] Slowly add 12 parts by weight of calcium petroleum sulfonate, 6 parts by weight of sodium petroleum sulfonate, 4 parts by weight of calcium-based composite agent CA-1295, 2 parts by weight of zinc naphthenate, and 1 part by weight of N-oleoylsarcosine-octadecylamine salt T711 to liquid A, and stir at 50°C for 30 min to obtain mixed liquid B.

[0040] Slowly add 1 part by weight of sorbitan monooleate Span-80 and 0.1 part by weight of 2,6-di-tert-butyl-p-cresol to mixed liquid B, and stir at 50°C for 10 min to obtain silicon steel rust-preventive oil.

[0041] Example 3

[0042] A rust-preventive oil for silicon steel comprises the following raw materials in parts by weight: 73.9 parts of isomeric solvent oil IP70, 9 parts of calcium petroleum sulfonate, 9 parts of sodium petroleum sulfonate, 3 parts of calcium-based composite agent CA-1295, 2 parts of zinc naphthenate, 1 part of N-oleoylsarcosine-octadecylamine salt T7111, 1 part of sorbitan monooleate Span-80, and 0.1 parts of 2,6-di-tert-butyl-p-cresol.

[0043] The preparation method of the silicon steel rust-preventive oil in Example 3 is as follows:

[0044] 73.9 parts by weight of the isomeric solvent oil IP70 was added to a clean beaker and stirred at 50°C for 15 min to obtain liquid A;

[0045] Slowly add 9 parts by weight of calcium petroleum sulfonate, 9 parts by weight of sodium petroleum sulfonate, 3 parts by weight of calcium-based composite agent CA-1295, 2 parts by weight of zinc naphthenate, and 1 part by weight of N-oleoylsarcosine-octadecylamine salt T711 to liquid A, and stir at 50°C for 30 min to obtain mixed liquid B.

[0046] Slowly add 1 part by weight of sorbitan monooleate Span-80 and 0.1 part by weight of 2,6-di-tert-butyl-p-cresol to mixed liquid B, and stir at 50°C for 10 min to obtain silicon steel rust-preventive oil.

[0047] Example 4

[0048] A rust-preventive oil for silicon steel comprises the following raw materials in parts by weight: 72.9 parts of isomeric solvent oil IP70, 9 parts of calcium petroleum sulfonate, 9 parts of sodium petroleum sulfonate, 4 parts of calcium-based composite agent CA-1295, 2 parts of zinc naphthenate, 1 part of N-oleoylsarcosine-octadecylamine salt T7111, 1 part of sorbitan monooleate Span-80, and 0.1 parts of 2,6-di-tert-butyl-p-cresol.

[0049] The preparation method of the silicon steel rust-preventive oil in Example 4 is as follows:

[0050] 72.9 parts by weight of the isomeric solvent oil IP70 was added to a clean beaker and stirred at 50°C for 15 min to obtain liquid A;

[0051] Slowly add 9 parts by weight of calcium petroleum sulfonate, 9 parts by weight of sodium petroleum sulfonate, 4 parts by weight of calcium-based composite agent CA-1295, 2 parts by weight of zinc naphthenate, and 1 part by weight of N-oleoylsarcosine-octadecylamine salt T711 to liquid A, and stir at 50°C for 30 min to obtain mixed liquid B.

[0052] Slowly add 1 part by weight of sorbitan monooleate Span-80 and 0.1 part by weight of 2,6-di-tert-butyl-p-cresol to mixed liquid B, and stir at 50°C for 10 min to obtain silicon steel rust-preventive oil.

[0053] Comparative Example 1

[0054] A rust-preventive oil comprising the following raw materials in parts by weight: 73.9 parts of isomeric solvent oil IP70, 18 parts of calcium petroleum sulfonate, 3 parts of calcium-based complex CA-1295, 2 parts of zinc naphthenate, 1 part of N-oleoylsarcosine-octadecylamine salt T711, 1 part of sorbitan monooleate Span-80, and 0.1 parts of 2,6-di-tert-butyl-p-cresol.

[0055] The method for preparing the rust-preventive oil in Comparative Example 1 is as follows:

[0056] 73.9 parts by weight of the isomeric solvent oil IP70 was added to a clean beaker and stirred at 50°C for 15 min to obtain liquid A;

[0057] Slowly add 18 parts by weight of calcium petroleum sulfonate, 3 parts by weight of calcium-based composite agent CA-12953, 2 parts by weight of zinc naphthenate and 1 part by weight of N-oleoylsarcosine-octadecylamine salt T711 to liquid A, and stir at 50°C for 30 min to obtain mixed liquid B.

[0058] Slowly add 1 part by weight of sorbitan monooleate Span-80 and 0.1 part by weight of 2,6-di-tert-butyl-p-cresol to mixed liquid B, and stir at 50°C for 10 min to obtain rust-preventive oil.

[0059] Comparative Example 2

[0060] A rust-preventive oil comprising the following raw materials in parts by weight: 73.9 parts of isomeric solvent oil IP70, 18 parts of sodium petroleum sulfonate, 3 parts of calcium-based complex CA-1295, 2 parts of zinc naphthenate, 1 part of N-oleoylsarcosine-octadecylamine salt T711, 1 part of sorbitan monooleate Span-80, and 0.1 parts of 2,6-di-tert-butyl-p-cresol.

[0061] The preparation method of the rust-preventive oil in Comparative Example 2 is as follows:

[0062] 73.9 parts by weight of the isomeric solvent oil IP70 was added to a clean beaker and stirred at 50°C for 15 min to obtain liquid A;

[0063] Slowly add 18 parts by weight of sodium petroleum sulfonate, 3 parts by weight of calcium-based composite agent CA-12953, 2 parts by weight of zinc naphthenate and 1 part by weight of N-oleoylsarcosine-octadecylamine salt T711 to liquid A, and stir at 50°C for 30 min to obtain mixed liquid B.

[0064] Slowly add 1 part by weight of sorbitan monooleate Span-80 and 0.1 part by weight of 2,6-di-tert-butyl-p-cresol to mixed liquid B, and stir at 50°C for 10 min to obtain rust-preventive oil.

[0065] Comparative Example 3

[0066] A rust-preventive oil comprises the following raw materials in parts by weight: 73.9 parts of isomeric solvent oil IP70, 6 parts of calcium petroleum sulfonate, 12 parts of sodium petroleum sulfonate, 3 parts of calcium-based complex CA-1295, 2 parts of zinc naphthenate, 1 part of N-oleoylsarcosine-octadecylamine salt T711, 1 part of sorbitan monooleate Span-80, and 0.1 parts of 2,6-di-tert-butyl-p-cresol.

[0067] The preparation method of the rust-preventive oil in Comparative Example 3 is as follows:

[0068] 73.9 parts by weight of the isomeric solvent oil IP70 was added to a clean beaker and stirred at 50°C for 15 min to obtain liquid A;

[0069] Slowly add 6 parts by weight of calcium petroleum sulfonate, 12 parts by weight of sodium petroleum sulfonate, 3 parts by weight of calcium-based composite agent CA-1295, 2 parts by weight of zinc naphthenate, and 1 part by weight of N-oleoylsarcosine-octadecylamine salt T711 to liquid A, and stir at 50°C for 30 min to obtain mixed liquid B.

[0070] Slowly add 1 part by weight of sorbitan monooleate Span-80 and 0.1 part by weight of 2,6-di-tert-butyl-p-cresol to mixed liquid B, and stir at 50°C for 10 min to obtain rust-preventive oil.

[0071] Comparative Example 4

[0072] A rust-preventive oil comprises the following raw materials in parts by weight: 73.9 parts of isomeric solvent oil IP70, 14 parts of calcium petroleum sulfonate, 4 parts of sodium petroleum sulfonate, 3 parts of calcium-based complex CA-1295, 2 parts of zinc naphthenate, 1 part of N-oleoylsarcosine-octadecylamine salt T711, 1 part of sorbitan monooleate Span-80, and 0.1 parts of 2,6-di-tert-butyl-p-cresol.

[0073] The preparation method of the rust-preventive oil in Comparative Example 4 is as follows:

[0074] 73.9 parts by weight of the isomeric solvent oil IP70 was added to a clean beaker and stirred at 50°C for 15 min to obtain liquid A;

[0075] Slowly add 14 parts by weight of calcium petroleum sulfonate, 4 parts by weight of sodium petroleum sulfonate, 3 parts by weight of calcium-based composite agent CA-1295, 2 parts by weight of zinc naphthenate, and 1 part by weight of N-oleoylsarcosine-octadecylamine salt T711 to liquid A, and stir at 50°C for 30 min to obtain mixed liquid B.

[0076] Slowly add 1 part by weight of sorbitan monooleate Span-80 and 0.1 part by weight of 2,6-di-tert-butyl-p-cresol to mixed liquid B, and stir at 50°C for 10 min to obtain rust-preventive oil.

[0077] Comparative Example 5

[0078] A rust-preventive oil comprising the following raw materials in parts by weight: 73.9 parts of isomeric solvent oil IP70, 9 parts of calcium petroleum sulfonate, 9 parts of sodium petroleum sulfonate, 2 parts of calcium-based complex CA-1295, 2 parts of zinc naphthenate, 1 part of N-oleoylsarcosine-octadecylamine salt T711, 1 part of sorbitan monooleate Span-80, and 0.1 parts of 2,6-di-tert-butyl-p-cresol.

[0079] The preparation method of the rust-preventive oil in Comparative Example 5 is as follows:

[0080] 73.9 parts by weight of the isomeric solvent oil IP70 was added to a clean beaker and stirred at 50°C for 15 min to obtain liquid A;

[0081] Slowly add 9 parts by weight of calcium petroleum sulfonate, 9 parts by weight of sodium petroleum sulfonate, 2 parts by weight of calcium-based composite agent CA-1295, 2 parts by weight of zinc naphthenate, and 1 part by weight of N-oleoylsarcosine-octadecylamine salt T711 to liquid A, and stir at 50°C for 30 min to obtain mixed liquid B.

[0082] Slowly add 1 part by weight of sorbitan monooleate Span-80 and 0.1 part by weight of 2,6-di-tert-butyl-p-cresol to mixed liquid B, and stir at 50°C for 10 min to obtain rust-preventive oil.

[0083] Comparative Example 6

[0084] A rust-preventive oil comprising the following raw materials in parts by weight: 73.9 parts of isomeric solvent oil IP70, 9 parts of calcium petroleum sulfonate, 9 parts of sodium petroleum sulfonate, 5 parts of calcium-based complex CA-1295, 2 parts of zinc naphthenate, 1 part of N-oleoylsarcosine-octadecylamine salt T711, 1 part of sorbitan monooleate Span-80, and 0.1 parts of 2,6-di-tert-butyl-p-cresol.

[0085] The preparation method of the rust-preventive oil in Comparative Example 6 is as follows:

[0086] 73.9 parts by weight of the isomeric solvent oil IP70 was added to a clean beaker and stirred at 50°C for 15 min to obtain liquid A;

[0087] Slowly add 9 parts by weight of calcium petroleum sulfonate, 9 parts by weight of sodium petroleum sulfonate, 5 parts by weight of calcium-based composite agent CA-1295, 2 parts by weight of zinc naphthenate, and 1 part by weight of N-oleoylsarcosine-octadecylamine salt T711 to liquid A, and stir at 50°C for 30 min to obtain mixed liquid B.

[0088] Slowly add 1 part by weight of sorbitan monooleate Span-80 and 0.1 part by weight of 2,6-di-tert-butyl-p-cresol to mixed liquid B, and stir at 50°C for 10 min to obtain rust-preventive oil.

[0089] Comparative Example 7

[0090] A rust-preventive oil comprising the following raw materials in parts by weight: 73.9 parts of isomeric solvent oil IP70, 9 parts of calcium petroleum sulfonate, 9 parts of sodium petroleum sulfonate, 4 parts of calcium-based complex CA-1295, 2 parts of zinc naphthenate, 1 part of sorbitan monooleate Span-80, and 0.1 parts of 2,6-di-tert-butyl-p-cresol.

[0091] The preparation method of the rust-preventive oil in Comparative Example 7 is as follows:

[0092] 73.9 parts by weight of the isomeric solvent oil IP70 was added to a clean beaker and stirred at 50°C for 15 min to obtain liquid A;

[0093] Slowly add 9 parts by weight of calcium petroleum sulfonate, 9 parts by weight of sodium petroleum sulfonate, 4 parts by weight of calcium-based composite agent CA-1295 and 2 parts by weight of zinc naphthenate to liquid A, and stir at 50°C for 30 minutes to obtain mixed liquid B.

[0094] Slowly add 1 part by weight of sorbitan monooleate Span-80 and 0.1 part by weight of 2,6-di-tert-butyl-p-cresol to mixed liquid B, and stir at 50°C for 10 min to obtain rust-preventive oil.

[0095] Comparative Example 8

[0096] A rust-preventive oil comprising the following raw materials in parts by weight: 73.9 parts of isomeric solvent oil IP70, 9 parts of calcium petroleum sulfonate, 9 parts of sodium petroleum sulfonate, 4 parts of calcium-based complex CA-1295, 2 parts of zinc naphthenate, 3 parts of N-oleoylsarcosine-octadecylamine salt T711, 1 part of sorbitan monooleate Span-80, and 0.1 parts of 2,6-di-tert-butyl-p-cresol.

[0097] The preparation method of the rust-preventive oil in Comparative Example 8 is as follows:

[0098] 73.9 parts by weight of the isomeric solvent oil IP70 was added to a clean beaker and stirred at 50°C for 15 min to obtain liquid A;

[0099] Slowly add 9 parts by weight of calcium petroleum sulfonate, 9 parts by weight of sodium petroleum sulfonate, 4 parts by weight of calcium-based composite agent CA-1295, 2 parts by weight of zinc naphthenate, and 3 parts by weight of N-oleoylsarcosine-octadecylamine salt T711 to liquid A, and stir at 50°C for 30 min to obtain mixed liquid B.

[0100] Slowly add 1 part by weight of sorbitan monooleate Span-80 and 0.1 part by weight of 2,6-di-tert-butyl-p-cresol to mixed liquid B, and stir at 50°C for 10 min to obtain rust-preventive oil.

[0101] Comparative Examples 9-11

[0102] Comparative Examples 9-11 used three different common thin-film rust-preventive oils available on the market.

[0103] The test methods for the performance of silicon steel rust-preventive oil or rust-preventive oil in the embodiments and comparative examples of this application are as follows:

[0104] (1) Visual inspection is used to determine the appearance;

[0105] (2) The closed-cup flash point of the rust-preventive oil was tested according to the national standard GB / T 261;

[0106] (3) The kinematic viscosity of the rust-preventive oil was tested according to the national standard GB / T 265;

[0107] (4) The salt spray resistance of the rust-preventive oil (the salt spray test of silicon steel uses silicon steel with a thickness of 0.2 mm) was tested according to the petrochemical industry standard SH / T 0081.

[0108] (5) The rust prevention properties of the rust-preventive oil under damp heat (the damp heat verification of silicon steel was performed using silicon steel with a thickness of 0.2 mm) were tested according to the national standard GB / T 2361.

[0109] The test results are shown in Tables 1, 2, 3 and 4.

[0110] Table 1 Test results of Examples 1-4

[0111] Test categories Example 1 Example 2 Example 3 Example 4 Appearance Brown and transparent Dark brown and transparent Brown and transparent Brown and transparent <![CDATA[Kinematic viscosity / mm 2 / s]]> 1.83 1.77 1.81 1.85 Flash point / °C 73.2 72.6 72.0 71.0 Salt spray rust prevention (standard) / h 156 153 155 156 Salt spray rust prevention (silicon steel) / h 38 36 38 38 Moisture and heat rust prevention (standard) / d 50 51 50 52 Moisture-heat rust prevention (silicon steel) / d 30 30 29 29

[0112] Table 2 Test results for comparative examples 1-4

[0113] Test categories Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Appearance Brown and transparent Brown and transparent Brown and transparent Brown and transparent <![CDATA[Kinematic viscosity / mm 2 / s]]> 1.81 1.75 1.82 1.84 Flash point / °C 73.7 72.9 71.0 71.7 Salt spray rust prevention (standard) / h 112 101 121 125 Salt spray rust prevention (silicon steel) / h 18 16 28 25 Moisture and heat rust prevention (standard) / d 28 27 31 32 Moisture-heat rust prevention (silicon steel) / d 19 21 25 23

[0114] The difference between the rust-preventive oils in Comparative Examples 1-4 and Example 3 lies in the different compounding ratios of calcium petroleum sulfonate and sodium petroleum sulfonate rust inhibitors. By comparing the test results of Example 3 with those of Comparative Examples 1-4 (see Tables 1 and 2), it can be found that the compounding ratio of calcium petroleum sulfonate and sodium petroleum sulfonate rust inhibitors in Example 3 has a better synergistic effect. The compounding scheme of calcium petroleum sulfonate and sodium petroleum sulfonate rust inhibitors using this dosage range can achieve the longest salt spray rust prevention period and wet heat rust prevention period.

[0115] Table 3. Test results of Comparative Examples 5-8

[0116] Test categories Comparative Example 5 Comparative Example 6 Comparative Example 7 Comparative Example 8 Appearance Brown and transparent Dark brown and transparent Brown and transparent Brown and transparent <![CDATA[Kinematic viscosity / mm 2 / s]]> 1.75 1.85 1.76 1.85 Flash point / °C 74.2 72.6 73.0 71.6 Salt spray rust prevention (standard) / h 136 143 135 146 Salt spray rust prevention (silicon steel) / h 32 35 28 38 Moisture and heat rust prevention (standard) / d 50 51 45 50 Moisture-heat rust prevention (silicon steel) / d 25 28 25 27

[0117] The rust-preventive oils in Comparative Examples 5-8 differ from those in Example 1 in the amount of calcium-based composite agent CA-1295 and N-oleoylsarcosine-octadecylamine salt T711 added. A comparison of the test results of Example 1 and Comparative Examples 5-8 shows (see Tables 1 and 3) that the scheme of adding calcium-based composite agent CA-1295 and N-oleoylsarcosine-octadecylamine salt T711 according to the proportions in Example 1 can achieve the longest salt spray rust prevention period and wet heat rust prevention period, and is also conducive to cost control.

[0118] Table 4. Test results for comparative examples 9-11

[0119]

[0120]

[0121] By comparing the test results of Example 1 with those of Comparative Examples 9-11 (see Tables 1 and 4), it can be found that the salt spray and damp heat rust prevention performance of ordinary film-type rust-preventive oils on silicon steel is poor, and there is a significant difference between the salt spray and damp heat rust prevention performance of Example 1.

[0122] The above description is only a preferred embodiment of the present invention. It should be noted that those skilled in the art can make several improvements and additions without departing from the method of the present invention, and these improvements and additions should also be considered within the scope of protection of the present invention.

Claims

1. A rust-preventive oil for silicon steel, characterized in that, It is composed of the following raw materials in parts by weight: 72-80 parts base oil, 15-25 parts rust inhibitor, 0.5-2 parts surfactant and 0.1-1 parts antioxidant; the rust inhibitor includes calcium petroleum sulfonate, sodium petroleum sulfonate, calcium-based compound, zinc naphthenate and N-oleoylsarcosine-octadecylamine salt; The weight ratio of the calcium petroleum sulfonate to the sodium petroleum sulfonate is (1-2):1; The calcium-based composite agent is NA-SUL CA-1259; The calcium-based complex is present in 3-4 parts by weight, and the N-oleoylsarcosine-octadecylamine salt is present in 1-2 parts by weight. The base oil is an isomeric solvent oil.

2. The silicon steel rust-preventive oil according to claim 1, characterized in that, The calcium petroleum sulfonate has an alkalinity value >295 mg KOH / g and a calcium content ≥11.6%.

3. The silicon steel rust-preventive oil according to claim 1, characterized in that, The sodium petroleum sulfonate has a sodium sulfonate content of ≥65% and a molecular weight of 500g / mol - 530g / mol.

4. The silicon steel rust-preventive oil according to claim 1, characterized in that, The surfactant is a dehydrated sorbitol fatty acid ester.

5. The silicon steel rust-preventive oil according to claim 1, characterized in that, The antioxidant is 2,6-di-tert-butyl-p-cresol.

6. A method for preparing a silicon steel rust-preventive oil as described in any one of claims 1 to 5, characterized in that, Includes the following steps: Under conditions of 45 ℃-55 ℃, the base oil and the rust inhibitor are mixed evenly, and then the surfactant and the antioxidant are added and mixed evenly to obtain the silicon steel rust-preventive oil.

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