Deoiling agent for removing oil on surfaces of silver and silver alloy materials and application

Abstract

According to the degreaser for removing oil on the surfaces of the silver and silver alloy materials and the application, animal and vegetable oil, mineral oil and polishing wax can be emulsified at one time to enable the particle size to be smaller than 100 nm and the emulsification stabilization time to be larger than or equal to 24 h at the temperature of 25-45 DEG C and the oil concentration range of 0.5-5 g / L through gradient HLB cooperation by means of four non-ionic surfactants, the whole system does not contain sulfur, phosphorus and nitrogen heterocyclic rings, the COD contribution is low, and the application range is wide. Discharge can be directly introduced into a conventional biochemical treatment tank, and nonionic compounds only form lt on the surfaces of silver and silver alloy; a weak adsorption layer with the thickness of 3 nm does not interfere with dense deposition of a corrosion inhibition film of a BTA-triethanolamine synergistic corrosion inhibition system, efficient oil removal and no corrosion are ensured, pentadecyl phenol polyoxyethylene ether has solubilizing and conveying effects on BTA, the corrosion inhibitor reaches the metal surface at the microsecond level, the corrosion inhibition efficiency is improved by 20-30%, and the corrosion inhibition effect is good. And triple breakthrough of'efficient oil removal, no corrosion and easy rinsing 'on the surfaces of the silver and the silver alloy is realized, so that the cleaning agent has outstanding creativity in the aspects of materials, formulas and processes.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of silver alloy material processing, in particular to a degreasing agent for degreasing the surface of silver and silver alloy materials and application thereof. BACKGROUND

[0002] The rivet type electrical contact material is widely used in various relays, circuit breakers, contactors, temperature controllers and the like, and is an important core component affecting the working reliability of the electrical contact system of the switch. The existing rivet type electrical contact is very easy to be contaminated in the process, resulting in oil stains adhering to the surface. The conventional degreasing solution has limited cleaning capacity for the surface of the rivet type electrical contact, and a small number of cleaning is not clean, resulting in oil stains remaining in the finished product and unqualified.

[0003] The traditional degreasing agent contains anionic system such as sodium dodecyl sulfate in the preparation composition, has poor water washing property and is easy to precipitate and cause secondary pollution. Such substances belong to high sulfur substances, and seriously corrode the surface of the rivet electrical contact. Therefore, a special degreasing agent for silver and silver alloy electrical contact materials is needed. SUMMARY

[0004] In order to solve the technical defects existing in the prior art, the present application provides a degreasing agent for degreasing the surface of silver and silver alloy materials and application thereof. With the integrated idea of "four non-ionic complex + BTA-triethanolamine synergistic corrosion inhibition + zero sulfur soap type washing", the triple breakthrough of "high-efficiency oil removal-no corrosion-easy rinsing" on the surface of silver and silver alloy is realized for the first time, so that the material, formula and process all have outstanding creativity.

[0005] The technical solution adopted by the present application is: a degreasing agent for degreasing the surface of silver and silver alloy materials, comprising the following components: a plurality of non-ionic surfactants with hydrophilic-lipophilic balance (HLB) gradient synergistic complementarity and sodium carboxylate soap, benzotriazole, triethanolamine and deionized water.

[0006] The plurality of non-ionic surfactants include short carbon chain C9-C11 non-ionic surfactants with HLB 12-14, medium carbon chain C11 branched non-ionic surfactants with HLB 11-13, long carbon chain C12-C15 non-ionic surfactants with HLB 9-11 and alkyl phenol ether non-ionic surfactants with HLB 10-12.

[0007] The degreasing agent comprises the following components: C9-C11 alcohol ethoxylate, C11 branched alcohol ethoxylate, C12-C15 alcohol ethoxylate, m-pentadecyl phenol polyoxyethylene ether, sodium carboxylate soap, benzotriazole, triethanolamine and deionized water.

[0008] The oil removing agent for removing oil on the surface of silver and silver alloy material comprises the following components in percentage by mass: C9-C11 alcohol ethoxylate 8%-15%, C11 branched alcohol ethoxylate 10%-14%, C12-C15 alcohol ethoxylate 20%-30%, meta-pentadecyl phenol polyoxyethylene ether 5%-10%, sodium carboxylate soap 2%-4%, benzotriazole 0.5%-0.8%, triethanolamine 2%-4%, and deionized water 5%-8%.

[0009] The oil removing agent is diluted with deionized water before use.

[0010] The dilution volume ratio of the oil removing agent to deionized water is 1:5-1:20.

[0011] The application of an oil removing agent in the preparation of an oil removing cleaning agent for silver and silver alloy electrical contact materials.

[0012] The silver and silver alloy electrical contact is a rivet type electrical contact.

[0013] The oil removing agent for removing oil on the surface of silver and silver alloy material comprises the following components in percentage by mass: C9-C11 alcohol ethoxylate 8%-15%, C11 branched alcohol ethoxylate 10%-14%, C12-C15 alcohol ethoxylate 20%-30%, meta-pentadecyl phenol polyoxyethylene ether 5%-10%, sodium carboxylate soap 2%-4%, benzotriazole 0.5%-0.8%, triethanolamine 2%-4%, and deionized water 5%-8%. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 Evaluation table for verifying the examples and comparative examples of the present application. DETAILED DESCRIPTION

[0015] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0016] Example 1 The present example provides a degreasing agent for degreasing the surface of silver and silver alloy material, which comprises the following components in mass percentage: C9-C11 alcohol ethoxylate 12%, C11 branched alcohol ethoxylate 12%, C12-C15 alcohol ethoxylate 25%, m-pentadecyl phenol polyoxyethylene ether 7%, benzotriazole 0.6%, sodium carboxylate soap 3%, triethanolamine 3%, and deionized water 6%.

[0017] The dilution ratio is degreasing agent: deionized water = 1:5 (volume percentage), the rivet type electrical contact is soaked in the degreasing agent, ultrasonic cleaning at 40℃ for 10 min, flowing water rinsing for 30 s, and hot air drying at 80℃ for 6 min.

[0018] Example 2 The present example provides a degreasing agent for degreasing the surface of silver and silver alloy material, which comprises the following components in mass percentage: C9-C11 alcohol ethoxylate 8%, C11 branched alcohol ethoxylate 10%, C12-C15 alcohol ethoxylate 20%, m-pentadecyl phenol polyoxyethylene ether 5%, benzotriazole 0.5%, sodium carboxylate soap 2%, triethanolamine 2%, and deionized water 8%.

[0019] The dilution ratio is degreasing agent: deionized water = 1:12.5 (volume percentage), the rivet type electrical contact is soaked in the degreasing agent, ultrasonic cleaning at 40℃ for 10 min, flowing water rinsing for 30 s, and hot air drying at 80℃ for 6 min.

[0020] Example 3 The present example provides a degreasing agent for degreasing the surface of silver and silver alloy material, which comprises the following components in mass percentage: C9-C11 alcohol ethoxylate 15%, C11 branched alcohol ethoxylate 14%, C12-C15 alcohol ethoxylate 30%, m-pentadecyl phenol polyoxyethylene ether 10%, benzotriazole 0.8%, sodium carboxylate soap 4%, triethanolamine 4%, and deionized water 5%.

[0021] The rivet-type electrical contact was immersed in the degreaser, ultrasonic cleaning at 40°C for 10 min, flowing water rinsing for 30 s, and hot air drying at 80°C for 6 min.

[0022] Comparative Example 1 The degreaser included the following components in mass percentage: sodium dodecyl sulfate 15%, sodium citrate 5%, and deionized water 80%.

[0023] The rivet-type electrical contact was immersed in the degreaser, ultrasonic cleaning at 40°C for 10 min, flowing water rinsing for 30 s, and hot air drying at 80°C for 6 min.

[0024] Comparative Example 2 The degreaser included the following components in mass percentage: C9-C11 alcohol ethoxylate 12%, C11 branched alcohol ethoxylate 12%, C12-C15 alcohol ethoxylate 25%, m-pentadecylphenol polyoxyethylene ether 7%, sodium carboxylate soap 3%, triethanolamine 3%, and deionized water 6%.

[0025] The rivet-type electrical contact was immersed in the diluted degreaser, ultrasonic cleaning at 40°C for 10 min, flowing water rinsing for 30 s, and hot air drying at 80°C for 6 min.

[0026] Comparative Example 3 The degreaser included the following components in mass percentage: C9-C11 alcohol ethoxylate 12%, C11 branched alcohol ethoxylate 12%, C12-C15 alcohol ethoxylate 25%, m-pentadecylphenol polyoxyethylene ether 7%, and deionized water 6%.

[0027] The rivet-type electrical contact was immersed in the diluted degreaser, ultrasonic cleaning at 40°C for 10 min, flowing water rinsing for 30 s, and hot air drying at 80°C for 6 min.

[0028] Test Method 1. Dirt removal rate: mass difference of oil dirt before and after cleaning / initial oil dirt mass × 100%.

[0029] 2. Surface reflectivity loss: difference of specular reflectivity at 550 nm before and after cleaning (negative sign represents decrease). 3. Corrosion weight gain: mass increase per unit area (sulfur corrosion product deposition) after 24 h at room temperature.

[0030] Results are shown in the attached Figure 1 chart.

[0031] Conclusion: Examples 1-3 all showed a decontamination rate of ≥96%, and the silver surface reflectivity decreased by <2%, with a corrosion weight gain of <0.02mg·cm⁻², fully meeting the appearance and performance requirements of silver and silver alloy electrical contacts.

[0032] Comparative Example 1 (containing anionic SDS) showed a significantly lower cleaning rate and exhibited obvious corrosion spots, with a reflectivity decrease of more than 5%.

[0033] Comparative Examples 2 and 3 lacked benzotriazole and triethanolamine, respectively. Although the cleaning rate was acceptable, the corrosion index deteriorated significantly, indicating that the two played a key role in corrosion inhibition and anti-oxidation in synergy.

[0034] Advantages of this invention: 1. Synergistic solubilization-emulsification mechanism Complementary hydrophilic-lipophilic balance (HLB) values: – Short carbon chain (C9-C11) varieties HLB 12-14, rapid penetration, reduced interfacial tension; – The medium carbon chain (C11 branched chain) variety HLB 11-13 is inserted into the oil / water interface film to form an elastic interface film and prevent droplet aggregation; – Long-chain (C12-C15) varieties HLB 9-11 offer high oil carrying capacity and can encapsulate large-sized oil slicks; – Alkylphenol ethers (m-pentadecanylphenol polyoxyethylene ether) HLB 10-12 have solubilizing sites for polar additives (fatty acid soaps, corrosion inhibitors), preventing phase separation.

[0035] – Four nonionic surfactants, through gradient HLB synergy, can emulsify animal and vegetable oils, mineral oils, and polishing waxes in a single application at 25-45 ℃ and 0.5-5 g / L oil concentrations, with a particle size <100 nm and an emulsion stability time ≥24 h.

[0036] 2. Dynamic interface exchange - easy rinsing mechanism The nonionic intermolecular hydrogen bond network is weaker than that of ionic surfactants, and is rapidly sheared by water during rinsing, with a residual amount of <1 mg / m² (detected by ion chromatography), thus achieving "easy rinsing".

[0037] 3. Zero sulfur and zero phosphorus environmental advantages The entire system contains no sulfur, phosphorus, or nitrogen heterocyclic compounds (except BTA), has a low COD contribution, and its emissions can be directly connected to conventional biological treatment ponds, meeting the GB 8978-1996 Class I standard.

[0038] 4. Synergistic advantages with corrosion inhibitor systems The non-ionic complexing agent forms a weak adsorption layer of <3 nm on the surface of silver and silver alloy, does not interfere with the dense deposition of BTA-triethanolamine corrosion inhibitor film, and ensures "high-efficiency oil removal-no corrosion".

[0039] The myristyl phenol polyoxyethylene ether has a solubilization-transportation effect on BTA, so that the corrosion inhibitor reaches the metal surface in microseconds, and the corrosion inhibition efficiency is improved by 20-30 %.

[0040] 5. Process adaptability The cloud point is >60 ℃ when the dilution ratio is 1:5-1:20 (volume ratio), which is suitable for various working conditions such as ultrasonic, spraying or immersion; Not sensitive to water hardness (0-500 ppm CaCO3), no risk of flocculation and stratification.

[0041] Technical personnel should know: although the present application has been described according to the above specific embodiments, the inventive idea of the present application is not limited to this invention, and any modification using the inventive idea will be included in the protection scope of the present patent.

[0042] The above is only the preferred embodiment of the present application, and the protection scope of the present application is not limited to the above examples. Any technical solution under the idea of the present application shall be included in the protection scope of the present application. It should be noted that, for ordinary technical personnel in the technical field, some improvements and decorations without departing from the principle of the present application shall also be considered as the protection scope of the present application.

Claims

1. An oil remover for removing oil from the surface of silver and silver alloy materials, characterized in that, It includes the following components: several nonionic surfactants with synergistic and complementary hydrophilic-lipophilic balance (HLB) gradients, sodium carboxylate soap, benzotriazole, triethanolamine, and deionized water.

2. The degreasing agent for removing oil from the surface of silver and silver alloy materials according to claim 1, characterized in that, The aforementioned nonionic surfactants include short-chain C9-C11 nonionic surfactants of HLB 12-14, medium-chain C11 branched nonionic surfactants of HLB 11-13, long-chain C12-C15 nonionic surfactants of HLB 9-11, and alkylphenol ether nonionic surfactants of HLB 10-12.

3. The degreasing agent for removing oil from the surface of silver and silver alloy materials according to claim 2, characterized in that, The degreasing agent comprises the following components: C9-C11 alcohol ethoxylates, C11 branched alcohol ethoxylates, C12-C15 alcohol ethoxylates, m-pentadecanylphenol polyoxyethylene ether, sodium carboxylate soap, benzotriazole, triethanolamine, and deionized water.

4. The degreasing agent for removing oil from the surface of silver and silver alloy materials according to claim 3, characterized in that, It includes the following components, by mass percentage: 8%-15% C9-C11 alcohol ethoxylates, 10%-14% C11 branched alcohol ethoxylates, 20%-30% C12-C15 alcohol ethoxylates, 5%-10% m-pentadecanophenol polyoxyethylene ether, 2%-4% sodium carboxylate soap, 0.5%-0.8% benzotriazole, 2%-4% triethanolamine, and 5%-8% deionized water.

5. The degreasing agent for removing oil from the surface of silver and silver alloy materials according to claim 1, characterized in that, The degreasing agent should be diluted with deionized water before use.

6. The degreasing agent for removing oil from the surface of silver and silver alloy materials according to claim 5, characterized in that, The volume ratio of the degreasing agent to deionized water is degreasing agent: deionized water = 1:5 to 1:

20.

7. The application of the degreasing agent according to claim 1 in the preparation of a degreasing cleaning agent for silver and silver alloy electrical contact materials.

8. The application according to claim 7, characterized in that, The silver and silver alloy electrical contacts are riveted type electrical contacts.

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