Brass anti-rust oil as well as preparation method and application thereof

Abstract

The invention relates to the technical field of anti-rust oil, and discloses brass anti-rust oil as well as a preparation method and application thereof.The brass anti-rust oil is prepared from the following raw materials in parts by weight: 3-5 parts of an anti-rust agent, 0.2-0.4 part of a surfactant, 0.1-0.2 part of an antioxidant, 2-3 parts of an anti-rust auxiliary agent and the balance of isomerous solvent oil; the antirust agent is prepared from N-octadecylamine oleoyl sarcosinate and Smart Base RP4460 according to the mass ratio of 1 to (1 to 2). According to the brass anti-rust oil provided by the invention, N-octadecylamine oleoyl sarcosinate and Smart Base RP4460 are selected as anti-rust agents, a multi-layer protection structure can be formed on the surface of brass, so that the brass anti-rust oil has excellent anti-rust property, has cleaning performance and low residue, can prevent the brass from color difference, uses isomerous solvent oil, does not have interference odor, and is safe and environment-friendly. The brass antirust oil is suitable for rust prevention of brass materials.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of rust-proof oil, in particular to a brass rust-proof oil and a preparation method and application thereof. BACKGROUND

[0002] Brass is widely used in the fields of electronic appliances, precision machinery, hardware decoration, etc. due to its excellent electrical conductivity, thermal conductivity and processing performance. As a copper-zinc alloy, brass is prone to micro-battery corrosion caused by water, oxygen, chloride ions and other media in the environment, forming rust products such as green rust (basic copper carbonate) and black spots (copper oxide), resulting in loss of surface gloss, decrease of mechanical strength, and even affecting assembly accuracy and service life. Currently, rust-proof oils on the market are mainly used for the protection of ferrous metals, and there is a lack of rust-proof oil specifically used for brass rust-proof.

[0003] Currently, the research on rust-proof oil is mainly focused on the development of general-purpose formulas (such as steel, iron-copper-aluminum compatibility), the improvement of basic rust-proof performance (such as short-term salt spray protection), and the optimization of single environmental protection indicators (such as low-aromatic hydrocarbon base oil), mainly focusing on the development of general-purpose formulas or copper rust-proof treatment process, i.e. polishing and passivation, without targeting the characteristics of brass. The existing solutions generally have the problem of insufficient targeting: some general-purpose rust-proof oils have a short rust-proof period for brass, making it difficult to meet the protection requirements; some formulas have thick oil films or residual impurities, affecting the surface gloss of brass and subsequent processing; existing rust-proof oils cause obvious color difference when applied to brass parts; they have high odor and poor cleaning performance. Moreover, the existing research does not fully consider the protection blind spot problem of brass special-shaped parts, resulting in the fact that the existing rust-proof oil cannot fully meet the special protection needs of brass parts. SUMMARY

[0004] The present application aims to improve at least one technical problem in the background art.

[0005] The first aspect of the present application provides a brass rust-proof oil, comprising the following raw materials by weight: 3-5 parts of rust-proof agent, 0.2-0.4 parts of surfactant, 0.1-0.2 parts of antioxidant, 2-3 parts of rust-proof auxiliary agent, and the balance being isomerized solvent oil; the rust-proof agent comprises N-oleoyl sarcosine octadecylamine salt and Smart Base RP4460 in a mass ratio of 1:(1-2).

[0006] This invention provides a brass rust-preventive oil with excellent rust prevention properties, cleaning performance, and low residue. It prevents color differences in brass, has no interfering odor, and is suitable for rust prevention on brass materials. N-oleoylsarcosine octadecylamine salt and Smart Base RP4460 are selected as rust inhibitors. Smart Base RP4460 adsorbs onto the copper surface to form a monolayer protective film, improving the color difference problem that occurs when applying brass rust-preventive oil to brass materials, while further enhancing the dehydration ability of the rust inhibitor and strengthening its rust prevention capabilities. N-oleoylsarcosine octadecylamine salt covers the steel surface and forms a supplementary coating at the edges or defects of the copper film, achieving multi-metal compatible protection. N-Oleylsarcosine octadecylamine salt and Smart Base RP4460 form a multi-layer protective structure on the brass surface. The inner chemical adsorption film formed by Smart Base RP4460 is tightly bonded to the brass surface, providing basic protection. The outer physical barrier film formed by N-oleylsarcosine octadecylamine salt prevents moisture penetration through hydrophobic chains, while its oil-soluble properties enhance compatibility with lubricating oils, reducing the risk of film peeling. The preferred mass ratio of N-oleylsarcosine octadecylamine salt and Smart Base RP4460 is 1:(1-2), effectively forming a stable protective layer on the brass surface, solving the problem that common rust-preventive oils cannot effectively form strong adhesion to the brass surface, resulting in unsatisfactory rust prevention effects. This invention selects rust inhibitors without barium salts and uses heterogeneous solvent oils, ensuring that brass workpieces coated with this brass rust-preventive oil product will not release irritating or significantly interfering odors, avoiding adverse problems to the environment and human health. At the same time, the heterogeneous solvent oil ensures a thinner brass rust-preventive oil film thickness, making it more suitable for the electronics, electrical appliances, and precision machinery industries.

[0007] Furthermore, the surfactant includes at least one of sorbitan oleate and sodium petroleum sulfonate.

[0008] The surfactants preferred in this invention are sorbitan oleate and sodium petroleum sulfonate. When sorbitan oleate and sodium petroleum sulfonate are added at an amount of 0.2-0.4 parts per 100 parts of brass rust-preventive oil, they will not cause discoloration of the brass.

[0009] Furthermore, the antioxidant includes 2,6-di-tert-butyl-p-cresol.

[0010] Furthermore, the rust-preventive additive includes palm oil.

[0011] The preferred rust inhibitor of this invention is palm oil. As a natural plant oil, palm oil has a low odor. Its corrosion inhibition effect is mainly achieved by forming an adsorption film on the copper surface, which blocks the contact between the corrosive medium and the copper, thereby slowing down the corrosion rate of the copper. At the same time, it can strengthen the rust-preventive film and enhance the rust-preventive performance.

[0012] Furthermore, the isomeric solvent oil includes C11-C13 isomeric alkanes.

[0013] The isomeric solvent oil of this invention preferably contains C11-C13 isoalkanes, which have the following advantages: low odor and extremely low aromatic content, enhancing worker comfort; high OELs (Occupational Exposure Limits), suitable for safe operation; high thermal and chemical stability to improve solvent lifespan; narrow distillation range and high purity. This helps reduce odor while ensuring a thinner rust-preventive oil film, making it more suitable for the electronics, electrical appliances, and precision machinery industries.

[0014] A second aspect of this invention provides a method for preparing the aforementioned brass rust-preventive oil, comprising the following steps: The heterogeneous solvent oil is heated to a first temperature, and then the antioxidant is added and mixed evenly to obtain mixture A; The surfactant is added to mixture A and mixed evenly at a second temperature to obtain mixture B; The rust inhibitor is added to the mixture B and mixed evenly at a third temperature to obtain mixture C; The rust-preventive additive is added to the mixture C and mixed evenly at a fourth temperature to obtain the brass rust-preventive oil; The first temperature is 50-55℃, the second temperature is 50-55℃, the third temperature is 50-55℃, and the fourth temperature is 50-55℃.

[0015] Furthermore, the first temperature is 55°C, the second temperature is 55°C, the third temperature is 55°C, and the fourth temperature is 55°C.

[0016] The third aspect of this invention provides the application of the above-mentioned brass rust-preventive oil in the rust prevention of brass materials.

[0017] The beneficial effects of the present invention are as follows: The brass rust-preventive oil provided by the present invention uses N-oleoylsarcosine octadecylamine salt and Smart Base RP4460 as rust inhibitors, which can form a multi-layer protective structure on the surface of brass, giving the brass rust-preventive oil excellent rust prevention properties, as well as cleaning performance and low residue. It can prevent color difference in brass, and uses heterogeneous solvent oil, which has no interfering odor, ensuring that the brass rust-preventive oil film thickness is relatively thin, making it suitable for rust prevention of brass materials. Detailed Implementation

[0018] 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.

[0019] The reagents / raw materials involved in the examples and comparative examples include: N-Oleoylsarcosine Octadecylamine Salt: Rugao Xilin Chemical Co., Ltd. Smart Base RP4460: Simin Oil & Chemical Co., Ltd. Sorbitol Oleate Span 80: Shaxian Licheng Chemical Co., Ltd. 2,6-Di-tert-butyl-p-cresol: Tianjin Yitaicheng Chemical Technology Co., Ltd. Palm oil: Yihai Kerry Arawana Food Group Co., Ltd. C11-C13 isoalkanes, Isopar L: ExxonMobil Example 1 A brass rust-preventive oil comprises the following raw materials in parts by weight: 1.5 parts of N-oleoylsarcosine octadecylamine salt (rust inhibitor), 1.5 parts of Smart Base RP4460 (rust inhibitor), 0.2 parts of Span 80 (surfactant), 0.1 parts of 2,6-di-tert-butyl-p-cresol (antioxidant), 2 parts of palm oil (rust-preventive auxiliary agent), and the balance being Isopar L (isomeric solvent oil).

[0020] Its preparation method is as follows: Isopar L was heated to 55°C, and then 2,6-di-tert-butyl-p-cresol was added and mixed thoroughly to obtain mixture A; Add Span 80 to mixture A and mix thoroughly at 55°C to obtain mixture B; N-oleoylsarcosine octadecylamine salt and Smart Base RP4460 were added to mixture B and mixed evenly at 55°C to obtain mixture C; Palm oil is added to mixture C and mixed evenly at 55°C to obtain brass rust-preventive oil.

[0021] Comparative Example 1 A brass rust-preventive oil comprises the following raw materials in parts by weight: 1.5 parts of N-oleoylsarcosine octadecylamine salt (rust inhibitor), 1.5 parts of Smart Base RP4460 (rust inhibitor), 0.6 parts of Span 80 (surfactant), 0.1 parts of 2,6-di-tert-butyl-p-cresol (antioxidant), 2 parts of palm oil (rust-preventive auxiliary agent), and the balance being Isopar L (isomeric solvent oil).

[0022] Its preparation method is as follows: Isopar L was heated to 55°C, and then 2,6-di-tert-butyl-p-cresol was added and mixed thoroughly to obtain mixture A; Add Span 80 to mixture A and mix thoroughly at 55°C to obtain mixture B; N-oleoylsarcosine octadecylamine salt and Smart Base RP4460 were added to mixture B and mixed evenly at 55°C to obtain mixture C; Palm oil is added to mixture C and mixed evenly at 55°C to obtain brass rust-preventive oil.

[0023] Comparative Example 2 A brass rust-preventive oil comprises the following raw materials in parts by weight: 1.5 parts of N-oleoylsarcosine octadecylamine salt (rust inhibitor), 1.5 parts of Smart Base RP4460 (rust inhibitor), 2 parts of Span 80 (surfactant), 0.1 parts of 2,6-di-tert-butyl-p-cresol (antioxidant), 2 parts of palm oil (rust-preventive auxiliary agent), and the balance being Isopar L (isomeric solvent oil).

[0024] Its preparation method is as follows: Isopar L was heated to 55°C, and then 2,6-di-tert-butyl-p-cresol was added and mixed thoroughly to obtain mixture A; Add Span 80 to mixture A and mix thoroughly at 55°C to obtain mixture B; N-oleoylsarcosine octadecylamine salt and Smart Base RP4460 were added to mixture B and mixed evenly at 55°C to obtain mixture C; Palm oil is added to mixture C and mixed evenly at 55°C to obtain brass rust-preventive oil.

[0025] Comparative Example 3 A brass rust-preventive oil comprises the following raw materials in parts by weight: 3 parts Smart Base RP4460 (rust inhibitor), 0.2 parts Span80 (surfactant), 0.1 parts 2,6-di-tert-butyl-p-cresol (antioxidant), 2 parts palm oil (rust-preventive aid), and the balance being Isopar L (isomeric solvent oil).

[0026] Its preparation method is as follows: Isopar L was heated to 55°C, and then 2,6-di-tert-butyl-p-cresol was added and mixed thoroughly to obtain mixture A; Add Span 80 to mixture A and mix thoroughly at 55°C to obtain mixture B; Add Smart Base RP4460 to mixture B and mix thoroughly at 55°C to obtain mixture C; Palm oil is added to mixture C and mixed evenly at 55°C to obtain brass rust-preventive oil.

[0027] Comparative Example 4 A brass rust-preventive oil comprises the following raw materials in parts by weight: 3 parts of N-oleoylsarcosine octadecylamine salt (rust inhibitor), 0.2 parts of Span 80 (surfactant), 0.1 parts of 2,6-di-tert-butyl-p-cresol (antioxidant), 2 parts of palm oil (rust-preventive auxiliary agent), and the balance being Isopar L (isomeric solvent oil).

[0028] Its preparation method is as follows: Isopar L was heated to 55°C, and then 2,6-di-tert-butyl-p-cresol was added and mixed thoroughly to obtain mixture A; Add Span 80 to mixture A and mix thoroughly at 55°C to obtain mixture B; Add N-oleoylsarcosine octadecylamine salt to mixture B and mix thoroughly at 55°C to obtain mixture C; Palm oil is added to mixture C and mixed evenly at 55°C to obtain brass rust-preventive oil.

[0029] Comparative Example 5 A brass rust-preventive oil comprises the following raw materials in parts by weight: 4 parts of N-oleoylsarcosine octadecylamine salt (rust inhibitor), 4 parts of Smart Base RP4460 (rust inhibitor), 0.2 parts of Span 80 (surfactant), 0.1 parts of 2,6-di-tert-butyl-p-cresol (antioxidant), 2 parts of palm oil (rust-preventive auxiliary agent), and the balance being Isopar L (isomeric solvent oil).

[0030] Its preparation method is as follows: Isopar L was heated to 55°C, and then 2,6-di-tert-butyl-p-cresol was added and mixed thoroughly to obtain mixture A; Add Span 80 to mixture A and mix thoroughly at 55°C to obtain mixture B; N-oleoylsarcosine octadecylamine salt and Smart Base RP4460 were added to mixture B and mixed evenly at 55°C to obtain mixture C; Palm oil is added to mixture C and mixed evenly at 55°C to obtain brass rust-preventive oil.

[0031] Comparative Example 6 A brass rust-preventive oil comprises the following raw materials in parts by weight: 1 part N-oleoylsarcosine octadecylamine salt (rust inhibitor), 1 part Smart Base RP4460 (rust inhibitor), 0.2 parts Span 80 (surfactant), 0.1 part 2,6-di-tert-butyl-p-cresol (antioxidant), 2 parts palm oil (rust-preventive auxiliary agent), and the balance being Isopar L (isomeric solvent oil).

[0032] Its preparation method is as follows: Isopar L was heated to 55°C, and then 2,6-di-tert-butyl-p-cresol was added and mixed thoroughly to obtain mixture A; Add Span 80 to mixture A and mix thoroughly at 55°C to obtain mixture B; N-oleoylsarcosine octadecylamine salt and Smart Base RP4460 were added to mixture B and mixed evenly at 55°C to obtain mixture C; Palm oil is added to mixture C and mixed evenly at 55°C to obtain brass rust-preventive oil.

[0033] Comparative Example 7 A brass rust-preventive oil comprises the following raw materials in parts by weight: 1.5 parts of N-oleoylsarcosine octadecylamine salt (rust inhibitor), 1.5 parts of Smart Base RP4460 (rust inhibitor), 0.2 parts of Span 80 (surfactant), 0.1 parts of 2,6-di-tert-butyl-p-cresol (antioxidant), and the balance being Isopar L (isomeric solvent oil).

[0034] Its preparation method is as follows: Isopar L was heated to 55°C, and then 2,6-di-tert-butyl-p-cresol was added and mixed thoroughly to obtain mixture A; Add Span 80 to mixture A and mix thoroughly at 55°C to obtain mixture B; N-Oleoylsarcosine octadecylamine salt and Smart Base RP4460 were added to mixture B and mixed evenly at 55°C to obtain brass rust-preventive oil.

[0035] Comparative Example 8 A brass rust-preventive oil comprises the following raw materials in parts by weight: 1.5 parts of N-oleoylsarcosine octadecylamine salt (rust inhibitor), 1.5 parts of Smart Base RP4460 (rust inhibitor), 0.2 parts of Span 80 (surfactant), 0.1 parts of 2,6-di-tert-butyl-p-cresol (antioxidant), 1 part of palm oil (rust-preventive auxiliary agent), and the balance being Isopar L (isomeric solvent oil).

[0036] Its preparation method is as follows: Isopar L was heated to 55°C, and then 2,6-di-tert-butyl-p-cresol was added and mixed thoroughly to obtain mixture A; Add Span 80 to mixture A and mix thoroughly at 55°C to obtain mixture B; N-oleoylsarcosine octadecylamine salt and Smart Base RP4460 were added to mixture B and mixed evenly at 55°C to obtain mixture C; Palm oil is added to mixture C and mixed evenly at 55°C to obtain brass rust-preventive oil.

[0037] Comparative Example 9 A brass rust-preventive oil comprises the following raw materials in parts by weight: 1.5 parts of N-oleoylsarcosine octadecylamine salt (rust inhibitor), 1.5 parts of Smart Base RP4460 (rust inhibitor), 0.2 parts of Span 80 (surfactant), 0.1 parts of 2,6-di-tert-butyl-p-cresol (antioxidant), 5 parts of palm oil (rust-preventive auxiliary agent), and the balance being Isopar L (isomeric solvent oil).

[0038] Its preparation method is as follows: Isopar L was heated to 55°C, and then 2,6-di-tert-butyl-p-cresol was added and mixed thoroughly to obtain mixture A; Add Span 80 to mixture A and mix thoroughly at 55°C to obtain mixture B; N-oleoylsarcosine octadecylamine salt and Smart Base RP4460 were added to mixture B and mixed evenly at 55°C to obtain mixture C; Palm oil is added to mixture C and mixed evenly at 55°C to obtain brass rust-preventive oil.

[0039] Performance testing The test methods for the brass rust-preventive oils prepared in the embodiments and comparative examples of this application are as follows: (1) Viscosity at 40℃: in accordance with GB / T 265-1988.

[0040] (2) Odor assessment: The odor level shall be assessed in accordance with the BYDQ-A1901.404-2015 odor test standard. At least 3 inspectors are required to conduct the assessment. If two inspectors have different ratings by two or more levels, 5 inspectors are required to reassess the odor. The odor level shall be divided into 1 to 6 levels according to Table 1. The assessment result shall be determined by the arithmetic mean of the ratings of different inspectors and rounded to one decimal place. The final rating shall be determined by a progressive system, which may result in a situation between two levels, i.e., level 0.5 (for example, if the average value is greater than 2 and less than 2.5, it shall be level 2.5; if the average value is greater than 2.5 and less than 3, it shall be level 3).

[0041] Table 1 Odor Rating Note: Interfering odors are those that are unpleasant and can cause nausea, dizziness, or other discomfort if inhaled for a prolonged period of time.

[0042] (3) Residue test: ①Referring to SH / T 0063-1991, replace the test piece with a brass piece, and polish, clean and dry the brass test piece; ② Pour the shaken sample into a beaker and remove air bubbles from the sample surface; ③ The prepared test piece is suspended by a stainless steel wire hook and vertically immersed in a sample at 23℃+3℃. After immersion for 1 minute, it is lifted upwards at a speed of 100mm per minute. ④ After applying the oil, hang the test piece on a rack and place it in a clean place at 23℃±3℃ to air dry for 24 hours. Then check the drying status of the oil film by touching it with your finger.

[0043] The representation of residues can be divided into four categories: a. Oil condition: The state of the oil film; b. Soft state: When you gently rub the oil film on the oiled test piece with your fingertip, the state in which a scratch is left is the soft state; c. Touch dry state: When you gently touch the center of the coated sample with your fingertip, the fingertip is dry without being contaminated by the sample. d. Non-stick state: Gently rub the center of the coating sample with your fingertip. The state in which no scratches are left on the coating is the non-stick state.

[0044] (4) Damp heat rust prevention test: ①Referring to GB / T 2361-1992, replace the test piece with a brass piece, and polish, clean and dry the brass test piece; ② Pour the shaken sample into a beaker and remove air bubbles from the sample surface; ③ The prepared test piece is suspended by a stainless steel wire hook and vertically immersed in a sample at 23℃±3℃. After immersion for 1 minute, it is lifted upwards at a speed of 100mm per minute. ④ After applying the oil, hang the test piece on a rack and place it in a clean place at 23℃±3℃ to air dry for 24 hours, then put it into a humid heat chamber.

[0045] (5) Whether there is a color difference in the brass sheet coated with anti-rust oil: Observe directly with the naked eye.

[0046] Table 2. Test results of the brass rust-preventive oils prepared in the embodiments and comparative examples of this application. Comparative Examples 1-2 provide two types of brass rust-preventive oils. The difference between them and Example 1 is the surfactant. Referring to Table 2, a comparison between Example 1 and Comparative Examples 1-2 shows that the surfactant addition scheme of Example 1 has lower residue. Using this scheme, no color difference appears on the brass sheet.

[0047] Comparative Examples 3-6 provide four types of brass rust-preventive oils. The difference between these and Example 1 lies in the different combinations of rust inhibitors. Referring to Table 2, it can be seen from Examples 1 and Comparative Examples 3-6 that the rust-preventive solution in Example 1 has a better rust-preventive effect, leaves less residue, and there is no color difference in the brass sheets after applying the rust-preventive oil. If the amount of rust inhibitor added is reduced, the rust-preventive performance is weakened; if the proportion of rust inhibitor added is incorrect, there will be color difference in the brass sheets after applying the rust-preventive oil, or the rust-preventive performance will be worse, and there may be a noticeable odor; if the amount of rust inhibitor added is the highest, the rust-preventive performance is enhanced, but there is more residue and a noticeable odor.

[0048] Comparative Examples 7-9 provide three types of brass rust-preventive oils. The difference between them and Example 1 lies in the amount of rust-preventive additives added. Referring to Table 2, it can be seen from Example 1 and Comparative Examples 7-9 that the rust-preventive additive scheme of Example 1 has a better rust-preventive effect. Using rust-preventive additives within this dosage range, the resulting combination of rust inhibitor and rust-preventive additive can achieve a good wet heat rust prevention cycle, with less residue and low odor.

[0049] The preferred embodiments of the present invention have been described in detail above, but the present disclosure is not limited to the embodiments described. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and these equivalent modifications or substitutions are all included within the scope defined by the claims of the present disclosure.

Claims

1. A brass rust-preventive oil, characterized in that, The raw materials include the following parts by weight: 3-5 parts of rust inhibitor, 0.2-0.4 parts of surfactant, 0.1-0.2 parts of antioxidant, 2-3 parts of rust inhibitory auxiliary agent, and the balance being isomeric solvent oil; the rust inhibitor includes N-oleoylsarcosine octadecylamine salt and Smart Base RP4460 in a mass ratio of 1:(1-2).

2. The brass rust-preventive oil according to claim 1, characterized in that: The surfactant includes at least one of sorbitan oleate and sodium petroleum sulfonate.

3. The brass rust-preventive oil according to claim 1, characterized in that: The antioxidant includes 2,6-di-tert-butyl-p-cresol.

4. The brass rust-preventive oil according to claim 1, characterized in that: The rust inhibitor includes palm oil.

5. The brass rust-preventive oil according to claim 1, characterized in that: The isomeric solvent oil includes C11-C13 isoalkanes.

6. A method for preparing a brass rust-preventive oil as described in any one of claims 1-5, characterized in that, Includes the following steps: The heterogeneous solvent oil is heated to a first temperature, and then the antioxidant is added and mixed evenly to obtain mixture A; The surfactant is added to mixture A and mixed evenly at a second temperature to obtain mixture B; The rust inhibitor is added to the mixture B and mixed evenly at a third temperature to obtain mixture C; The rust-preventive additive is added to the mixture C and mixed evenly at a fourth temperature to obtain the brass rust-preventive oil; The first temperature is 50-55℃, the second temperature is 50-55℃, the third temperature is 50-55℃, and the fourth temperature is 50-55℃.

7. The method for preparing brass rust-preventive oil according to claim 6, characterized in that: The first temperature is 55°C, the second temperature is 55°C, the third temperature is 55°C, and the fourth temperature is 55°C.

8. The application of the brass rust-preventive oil as described in any one of claims 1-5 in the rust prevention of brass materials.

Images