A drawing cooling liquid special for aluminum zip-top can production and a preparation method thereof

Abstract

The present application relates to the field of metal processing cooling liquid, especially to a special drawing cooling liquid for aluminum pop can production and a preparation method thereof.The special drawing cooling liquid for aluminum pop can production comprises, in mass percentage, 5-25% of carbon material reinforcing liquid, 5-15% of surfactant, 5-15% of functional additive, 1-5% of antibacterial agent, 5-10% of complexing agent, 1-5% of oil control agent, 0.1-5% of pH regulator, 0.01-0.1% of defoaming agent, and the rest of deionized water.The processing cooling liquid provided in the present application can be used as a special drawing cooling liquid for the drawing and thinning process of aluminum pop can, and can play excellent drawing cooling, lubrication and rust prevention functions simultaneously.

Description

Technical Field

[0001] This invention relates to the field of metalworking coolants, and more particularly to a stretching coolant specifically for aluminum beverage can production and its preparation method. Background Technology

[0002] Aluminum products are widely used in the food packaging industry worldwide due to their excellent packaging properties and wide availability. The primary form of aluminum packaging is the aluminum can, with products such as beer and cola preferentially choosing aluminum cans for packaging. The production of aluminum cans uses aluminum coils as raw material, and the process is relatively complex. This results in processes involving metal stretching, deformation, heating, and friction and wear during the production of aluminum cans, requiring the use of functional fluids such as lubricants and coolants.

[0003] In the thinning and stretching process of aluminum cans, a stretching coolant is typically used as a lubricating medium to ensure smooth operation. However, existing coolant products suffer from poor lubrication and weak rust prevention. Chinese patent CN114686292A provides a metalworking coolant with rust prevention properties, whose main ingredients include vegetable oil, surfactants, and rust inhibitors. It claims to have produced a metalworking coolant with rust prevention effects, but it fails to adequately address lubrication performance, particularly regarding issues such as stretching streaks and surface scratches that occur during the stretching process of aluminum cans.

[0004] Therefore, in order to address the rust prevention and lubrication requirements of aluminum cans during the stretching process, this application provides a special stretching coolant for aluminum can production and its preparation method. Summary of the Invention

[0005] To address the aforementioned problems, the first aspect of this invention provides a special stretching coolant for the production of aluminum cans. The raw materials, by mass percentage, include: 5-25% carbon material reinforcing liquid, 5-15% surfactant, 5-15% functional additives, 1-5% antibacterial agent, 5-10% complexing agent, 1-5% oil control agent, 0.1-5% pH adjuster, 0.01-0.1% defoamer, and deionized water to make up the balance.

[0006] As a preferred embodiment, the carbon material reinforcing liquid is an aqueous dispersion of at least one of carbon powder, carbon nanotubes, graphene, graphene oxide, fullerene, and carbon black.

[0007] As a preferred embodiment, the carbon material reinforcing liquid is an aqueous dispersion of graphene oxide.

[0008] As a preferred option, the thickness of a single graphene oxide sheet is less than or equal to 5 nm, and the sheet diameter is 5 to 30 μm.

[0009] As a preferred embodiment, the mass ratio of the carbon material reinforcing liquid to the functional additive is 5-20:10-15.

[0010] As a preferred embodiment, the mass ratio of the carbon material reinforcing liquid to the functional additive is 20:14.

[0011] As a preferred embodiment, the concentration of the carbon material reinforcing liquid is 1–4 mg / mL.

[0012] As a preferred embodiment, the concentration of the carbon material reinforcing liquid is 1–2 mg / mL.

[0013] As a preferred embodiment, the concentration of the carbon material reinforcing liquid is 2 mg / mL.

[0014] As a preferred embodiment, the functional additive is at least one of rust inhibitors, lubricants, flame retardants, anti-yellowing agents, and stabilizers.

[0015] As a preferred embodiment, the functional additives are rust inhibitors and lubricants, with a mass ratio of 3-4:8-10.

[0016] As a preferred embodiment, the mass ratio of the rust inhibitor to the lubricant is 4:10.

[0017] As a preferred embodiment, the rust inhibitor is sodium methylbenzotriazole.

[0018] As a preferred embodiment, the lubricant is at least one of castor oil, hydrogenated vegetable oil, and lauryl alcohol.

[0019] As a preferred option, the lubricant is lauryl alcohol.

[0020] In this application, a graphene oxide aqueous dispersion is used in combination with rust inhibitors and lubricants, which significantly improves the coolant's resistance to stretching streaks and surface scratches that occur during the stretching process, while also greatly reducing aluminum sheet rusting. The applicant believes that the rust inhibitors and lubricants typically used in dispersions cannot meet the corresponding functions in the stretching process of aluminum cans, exhibiting poor resistance. However, the graphene oxide aqueous dispersion added in this application, especially when its mass ratio with functional additives is 20:14, can, on the basis of the basic rust prevention and lubrication provided by sodium methylbenzotriazole and lauryl alcohol, utilize its crystalline multi-layered structure to disperse the internal shear force during the aluminum product processing, thus reducing scratching. Furthermore, the excellent self-dispersing and assembly properties of graphene oxide can significantly reduce the direct contact between oxidation sites and oxygen during use, thereby preventing oxidation reactions for a longer period and enhancing rust prevention performance.

[0021] As a preferred embodiment, the surfactant is at least one of a nonionic surfactant, an amphoteric surfactant, and anionic surfactant.

[0022] As a preferred embodiment, the surfactant is a nonionic surfactant.

[0023] As a preferred embodiment, the nonionic surfactant is at least one of polyoxyethylene (20) dehydrated sorbitan monolaurate, isomeric 13 fatty alcohol polyoxyethylene ether, lauryl alcohol polyoxyethylene ether, cetearyl alcohol polyoxyethylene ether, tristyrene phenol polyoxyethylene ether, and stilbene phenol polyoxyethylene ether.

[0024] As a preferred embodiment, the nonionic surfactant is polyoxyethylene (20) dehydrated sorbitan monolaurate.

[0025] As a preferred embodiment, the complexing agent is at least one selected from sodium tripolyphosphate, sodium pyrophosphate, sodium hexametaphosphate, sodium tartrate, monoethanolamine, diethanolamine, and triethanolamine.

[0026] As a preferred embodiment, the complexing agent is sodium tartrate.

[0027] As a preferred embodiment, the oil-controlling agent is at least one of polyaluminum chloride, sodium silicate, and polyferric sulfate.

[0028] As a preferred embodiment, the oil-controlling agent is polyaluminum chloride.

[0029] As a preferred embodiment, the antibacterial agent is at least one of the azoline antibacterial agents.

[0030] As a preferred embodiment, the antibacterial agent is benzisothiazolinone.

[0031] As a preferred embodiment, the pH adjuster is at least one of the alcohol amines.

[0032] As a preferred embodiment, the pH adjuster is diethylene glycolamine.

[0033] As a preferred option, the defoamer is an organosilicone defoamer.

[0034] The second aspect of the present invention provides a method for preparing the above-mentioned special stretching coolant for aluminum can production, comprising the following steps: (1) adding deionized water and heating to 50-70°C, keeping the temperature and adding surfactant, functional additive and complexing agent and stirring for 30-40 min to dissolve evenly; (2) cooling to 40-45°C, adding pH adjuster, carbon material reinforcing liquid and antibacterial agent in sequence and stirring for 30-40 min to dissolve evenly; (3) cooling to 35-38°C, then adding oil control agent and defoamer in sequence, stirring for 30-40 min, and then continuing to stir until the temperature drops to room temperature of 25°C, thus obtaining the product.

[0035] Beneficial effects:

[0036] 1. The processing coolant provided in this application can be used as a special stretching coolant for the stretching and thinning process of aluminum cans. It can provide excellent stretching cooling while also providing excellent lubrication and rust prevention.

[0037] 2. The method for preparing a processing coolant provided in this application is simple to operate and has a concise procedure, which can facilitate enterprises to carry out large-scale experiments or production, thereby effectively reducing the enterprise's usage costs.

[0038] 3. The processing coolant provided in this application can effectively avoid surface defects caused by tensile injuries during the stretching process, improve product quality and production capacity, reduce the defect rate, enhance the protection of equipment such as molds, extend the service life of the corresponding equipment, and reduce the frequency of cleaning and maintenance.

[0039] 4. The processing coolant provided in this application can reduce the actual amount of coolant used through its excellent cooling, rust prevention and lubrication properties, thereby reducing the discharge and treatment costs of wastewater and waste chemicals, and reducing environmental pressure and costs.

[0040] 5. The processing coolant provided in this application uses a combination of graphene oxide aqueous dispersion, rust inhibitor, and lubricant, which significantly improves the coolant's resistance to stretching streaks and surface scratches that occur during the stretching process. In particular, when the mass ratio of graphene oxide to functional additives is 20:14, it can utilize the multi-layered, crystalline lauryl alcohol to disperse the internal shear force of aluminum products during the process, thereby reducing the scratches that occur during the process, on the basis of the basic rust prevention and lubrication performance provided by sodium methylbenzotriazole and lauryl alcohol. Detailed Implementation

[0041] Example 1

[0042] Example 1 provides a special stretching coolant for the production of aluminum cans. By mass percentage, the raw materials include: 5% carbon material reinforcing liquid, 5% surfactant, 11% functional additives, 3% antibacterial agent, 6% complexing agent, 2% oil control agent, 2% pH adjuster, 0.1% defoamer, and deionized water to make up the balance.

[0043] The carbon material reinforcement solution is an aqueous dispersion of graphene oxide with a concentration of 2 mg / mL. The thickness of a single graphene oxide sheet is 4.2 nm, and the sheet diameter is 10 μm.

[0044] The surfactant is polyoxyethylene (20) dehydrated sorbitan monolaurate.

[0045] The functional additives are rust inhibitors and lubricants in a mass ratio of 3:8. The rust inhibitor is sodium methylbenzotriazole, and the lubricant is lauryl alcohol.

[0046] The antibacterial agent is benzisothiazolinone.

[0047] The complexing agent is sodium tartrate.

[0048] The oil control agent is polyaluminum chloride, which was purchased from Shandong Mingjiang Chemical Co., Ltd. as a national standard chemical grade polyaluminum chloride (PAC) product.

[0049] pH adjuster diethylene glycolamine.

[0050] The defoamer is HP970 silicone defoamer sold by Qixin Chemical.

[0051] All other raw materials were purchased from legitimate channels.

[0052] The second aspect of this embodiment provides a method for preparing the above-mentioned stretching coolant for aluminum can production, the steps of which include the following: (1) adding deionized water and heating to 60°C, keeping it at the temperature and adding surfactant, functional additive and complexing agent and stirring for 35 min to dissolve evenly; (2) cooling to 45°C, adding pH adjuster, carbon material reinforcing liquid and antibacterial agent in sequence and stirring for 35 min to dissolve evenly; (3) cooling to 35°C, then adding oil control agent and defoamer in sequence, stirring for 32 min, and then continuing to stir until the temperature drops to room temperature of 25°C, thus obtaining the product.

[0053] Example 2

[0054] Example 2 provides a special stretching coolant for the production of aluminum cans. By mass percentage, the raw materials include: 20% carbon material reinforcing liquid, 10% surfactant, 14% functional additives, 3% antibacterial agent, 4% complexing agent, 3% oil control agent, 3% pH adjuster, 0.1% defoamer, and deionized water to make up the balance.

[0055] The carbon material reinforcement solution is an aqueous dispersion of graphene oxide with a concentration of 2 mg / mL.

[0056] The surfactant is polyoxyethylene (20) dehydrated sorbitan monolaurate.

[0057] The functional additives are rust inhibitors and lubricants in a mass ratio of 4:10. The rust inhibitor is sodium methylbenzotriazole, and the lubricant is lauryl alcohol.

[0058] The antibacterial agent is benzisothiazolinone.

[0059] The complexing agent is sodium tartrate.

[0060] The oil control agent is polyaluminum chloride, which was purchased from Shandong Mingjiang Chemical Co., Ltd. as a national standard chemical grade polyaluminum chloride (PAC) product.

[0061] pH adjuster diethylene glycolamine.

[0062] The defoamer is HP970 silicone defoamer sold by Qixin Chemical.

[0063] All other raw materials were purchased from legitimate channels.

[0064] The second aspect of this embodiment provides a method for preparing the above-mentioned special stretching coolant for aluminum can production, the steps of which include the following steps: (1) adding deionized water and heating to 65°C, keeping the temperature and adding surfactant, functional additive and complexing agent and stirring for 33 min to dissolve evenly; (2) cooling to 45°C, adding pH adjuster, carbon material reinforcing liquid and antibacterial agent in sequence and stirring for 34 min to dissolve evenly; (3) cooling to 32°C, then adding oil control agent and defoamer in sequence, stirring for 30 min, and then continuing to stir until the temperature drops to room temperature of 25°C, thus obtaining the product.

[0065] Comparative Example 1

[0066] The specific implementation method of this comparative example is the same as that of Example 1, except that the amount of graphene oxide aqueous dispersion added in the raw materials is 2.5%.

[0067] Comparative Example 2

[0068] The specific implementation method of this comparative example is the same as that of Example 2, except that: the concentration of the graphene oxide aqueous dispersion in the raw materials is 1.5 mg / mL, the amount of graphene oxide aqueous dispersion added is 20%, and the amount of functional additive added is 8%.

[0069] Performance Evaluation

[0070] Lubrication test: Tested using a four-ball machine according to national standard GB / T 3142. The PB value represents the maximum non-seize load. The larger the PB value, the greater the oil film strength and the better the lubrication. The average value of 10 measurements is recorded in Table 1.

[0071] Rust prevention test: Place 2 grams of cast iron filings evenly on the filter paper of a petri dish. Use a dropper to evenly drop 2 grams of sample onto the cast iron filings. After keeping it in the dark for 2 hours, remove the petri dishes, remove the iron filings, and observe the rust on the filter paper. The results are divided into 0-5 levels, with level 0 being the best and level 5 being the worst. The results are recorded in Table 1.

[0072] Grade 0: No rust or corrosion.

[0073] Grade 1, very minor corrosion.

[0074] Grade 2, slight corrosion, with approximately 1% of the surface showing rust spots.

[0075] Level 3, moderate corrosion, with approximately 1-5% of the surface corroded.

[0076] Level 4, severe corrosion, with more than 5% of the surface corroded.

[0077] Table 1

[0078]

Claims

1. A special stretching coolant for aluminum can production, characterized in that: By mass percentage, the raw materials include: 5-25% carbon material reinforcing liquid, 5-15% surfactant, 5-15% functional additives, 1-5% antibacterial agent, 5-10% complexing agent, 1-5% oil control agent, 0.1-5% pH adjuster, 0.01-0.1% defoamer, and deionized water to make up the balance. The carbon material reinforcement solution is an aqueous dispersion of graphene oxide with a concentration of 1~4 mg / mL; The thickness of the single layer of graphene oxide is ≤5nm, and the sheet diameter is 5~30μm; The mass ratio of the graphene oxide aqueous dispersion to the functional additive is 20:14; The functional additives are rust inhibitors and lubricants, with a mass ratio of 3~4:8~10; The rust inhibitor is sodium methylbenzotriazole; The lubricant is at least one of castor oil, hydrogenated vegetable oil, and lauryl alcohol; The complexing agent is at least one of sodium tripolyphosphate, sodium pyrophosphate, sodium hexametaphosphate, sodium tartrate, monoethanolamine, diethanolamine, and triethanolamine. The oil-controlling agent is at least one of polyaluminum chloride, sodium silicate, and polyferric sulfate.

2. The special stretching coolant for aluminum can production according to claim 1, characterized in that: The surfactant is at least one of nonionic surfactants, amphoteric surfactants, and anionic surfactants.

3. The special stretching coolant for aluminum can production according to claim 2, characterized in that: The antibacterial agent is at least one of the azoline antibacterial agents, the pH adjuster is at least one of the organic alcohol amines, and the defoamer is an organosilicone defoamer.

4. A method for preparing a special stretching coolant for aluminum can production according to any one of claims 1 to 3, characterized in that: The steps include the following: (1) Add deionized water and heat to 50~70℃, keep warm and add surfactant, functional additive and complexing agent and stir for 30~40min to dissolve evenly; (2) Cool down to 40~45℃, add pH adjuster, carbon material reinforcing liquid and antibacterial agent in sequence and stir for 30~40min to dissolve evenly; (3) Cool down to 35~38℃, add oil control agent and defoamer in sequence, stir for 30~40min, and then continue to stir until the temperature drops to room temperature of 25℃, and the product is obtained.

Images