Stretching cooling liquid with self-cleaning function as well as preparation method and application thereof

Abstract

The invention provides stretching cooling liquid with a self-cleaning function as well as a preparation method and application thereof, and belongs to the field of metal processing cooling liquid. According to the stretching cooling liquid with the self-cleaning function, the coupling agent, the adamantane derivative and the lubricating agent are matched with one another, the lubricating performance of the stretching cooling liquid can be remarkably improved, adsorption of residues on the surface of a ring-pull can is reduced, the residues can be complexed into the stretching cooling liquid through addition of the complexing agent, and the service life of the ring-pull can is prolonged. The cooling liquid is removed along with stretching; the emulsifier can play a role in stabilizing a system, so that all the components form a uniform and stable system in the carrier matrix, the uniformity is ensured to be kept in the subsequent use process, and meanwhile, the emulsifier can also play a certain lubricating effect to further remove residues; after the components are optimized, a cleaning process in the processing process of the zip-top can can be omitted, the production cost is effectively reduced, the production efficiency is improved, wastewater discharge is reduced, and the zip-top can is more energy-saving and environment-friendly.

Description

Technical Field

[0001] The present invention relates to the field of metal processing coolants, in particular to a stretching coolant with a self-cleaning function, a preparation method thereof and an application thereof. Background Art

[0002] Aluminum cans are widely used in food packaging, including beverages like beer and cola. The production process, which uses aluminum coil as raw material, is relatively complex and typically involves punching, thinning and stretching, cleaning, passivation, printing, internal coating, necking and flanging, testing, and packaging.

[0003] The thinning and stretching of aluminum cans involves stretching, deformation, heating, friction, and wear of the metal material. During this process, a stretching coolant is required as a lubricant to ensure smooth thinning and stretching. The main functions of the stretching coolant are to provide lubrication between the can body and the mold; absorb heat generated during the stretching process; effectively prevent rust on the mold and equipment; and also provide a pre-cleaning function, supporting subsequent cleaning processes.

[0004] After the thinning and stretching process is completed, the existing stretching coolant technology will leave a certain amount of grease (from a mixture of cupping oil, stretching fluid and mechanical miscellaneous oil) and aluminum powder (produced by the aluminum material during the cupping and thinning and stretching process) on the surface of the can. These residues must be thoroughly cleaned before the surface is passivated and film-formed to avoid affecting the subsequent passivation film-forming, printing and can coating processes, otherwise it will affect product quality and qualification rate.

[0005] In order to solve the above problems, the existing process needs to use a large amount of cleaning agents to clean the residues. Although this method can remove the residues, it will have the following problems: (1) The cleaning process requires the configuration of special process equipment and personnel maintenance, which not only increases the production investment cost but also affects the production capacity; (2) The cleaning process is prone to the problem of unclean cleaning, which affects production efficiency; (3) The cleaning process requires the use of a large amount of strong acid cleaning agents and produces a large amount of industrial wastewater, which has high application costs and great environmental pressure.

[0006] Therefore, providing a stretching coolant with a self-cleaning function to avoid the subsequent cleaning process has become a technical problem that needs to be solved urgently in this field. Summary of the Invention

[0007] The purpose of the present invention is to provide a stretching coolant with self-cleaning function and its preparation method and application. The stretching coolant provided by the present invention can effectively remove residues in the stretching process of cans, thereby eliminating the subsequent cleaning process.

[0008] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0009] The invention provides a stretching coolant with a self-cleaning function. The coolant comprises the following components, calculated by mass percentage: 85-95% of a carrier matrix, 0.5-2.5% of a coupling agent, 0.05-0.2% of an adamantane derivative, 0.5-3.0% of a lubricant, 0.05-0.2% of a rust inhibitor, 0.1-2.0% of a complexing agent, 0.5-4.0% of a builder, 0.05-1.0% of a bactericide, 0.6-3.0% of an emulsifier, and 0.005-0.02% of a defoaming agent.

[0010] Preferably, the coupling agent includes dimethyl sulfoxide, N-methylpyrrolidone, dimethylformamide or dimethylacetamide.

[0011] Preferably, the adamantane derivative is a carboxyadamantane derivative.

[0012] Preferably, the lubricant comprises an aqueous oxidized polyethylene wax emulsion.

[0013] Preferably, the rust inhibitor is a siloxane ketone water-soluble corrosion inhibitor.

[0014] Preferably, the complexing agent is sodium polyacrylate.

[0015] Preferably, the builder is a basic amino acid.

[0016] Preferably, the emulsifier includes a polyoxyethylene ether emulsifier.

[0017] The present invention provides a method for preparing the stretching coolant with self-cleaning function described in the above technical solution, comprising the following steps:

[0018] (1) mixing a carrier matrix, a coupling agent, an adamantane derivative, a rust inhibitor, a complexing agent, and a builder to obtain a mixed solution;

[0019] (2) The mixed liquid obtained in step (1), a lubricant, a bactericide, an emulsifier and a defoaming agent are mixed to obtain a stretching cooling liquid with a self-cleaning function.

[0020] The present invention provides the use of the stretching cooling liquid with self-cleaning function described in the above technical solution or the stretching cooling liquid with self-cleaning function prepared by the preparation method described in the above technical solution in the production process of cans.

[0021] The invention provides a stretching coolant with a self-cleaning function. The coolant comprises the following components, calculated by mass percentage: 85-95% of a carrier matrix, 0.5-2.5% of a coupling agent, 0.05-0.2% of an adamantane derivative, 0.5-3.0% of a lubricant, 0.05-0.2% of a rust inhibitor, 0.1-2.0% of a complexing agent, 0.5-4.0% of a builder, 0.05-1.0% of a bactericide, 0.6-3.0% of an emulsifier, and 0.005-0.02% of a defoaming agent. In the stretching coolant with self-cleaning function provided by the present invention, the coupling agent, the adamantane derivative and the lubricant cooperate with each other to significantly improve the lubrication performance of the stretching coolant, thereby reducing the adsorption of residues on the surface of the can; the addition of the complexing agent can complex the residues into the stretching coolant and remove them along with the stretching coolant; the emulsifier can play a role in stabilizing the system, thereby allowing the various components to form a uniform and stable system in the carrier matrix, ensuring that the uniformity is maintained during subsequent use, and the emulsifier can also play a certain lubricating effect, further removing the residues; the builder can improve the self-cleaning function of the stretching coolant, and further remove the residues in the thinning and stretching process of the can; by adding the defoaming agent, bubbles can be quickly eliminated, thereby improving the removal efficiency of the residues; the rust inhibitor can enable the stretching coolant to improve the rust prevention performance of the metal matrix, thereby improving its surface quality; the bactericide can improve the bactericidal performance of the stretching coolant; after optimizing the components, the cleaning process in the can processing process can be eliminated, effectively reducing production costs, improving production efficiency, reducing wastewater discharge, and being more energy-saving and environmentally friendly. The results of the examples show that the stretching coolant provided by the present invention can complete self-cleaning in only 30 seconds, while the conventional stretching coolant currently available on the market cannot achieve self-cleaning even after 180 seconds, indicating that the stretching coolant provided by the present invention has excellent self-cleaning performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The figure is a schematic diagram of the process flow of preparing cans;

[0023] Figure 2 Schematic diagram of the cleaning process when using conventional stretching coolant currently available on the market;

[0024] Figure 3 This is a schematic diagram of the cleaning process when using the stretching coolant provided by the present invention. DETAILED DESCRIPTION

[0025] The invention provides a stretching coolant with a self-cleaning function. The coolant comprises the following components, calculated by mass percentage: 85-95% of a carrier matrix, 0.5-2.5% of a coupling agent, 0.05-0.2% of an adamantane derivative, 0.5-3.0% of a lubricant, 0.05-0.2% of a rust inhibitor, 0.1-2.0% of a complexing agent, 0.5-4.0% of a builder, 0.05-1.0% of a bactericide, 0.6-3.0% of an emulsifier, and 0.005-0.02% of a defoaming agent.

[0026] In the present invention, unless otherwise specified, the raw materials used in the present invention are all commercially available products well known to those skilled in the art or products prepared by methods known in the art.

[0027] The stretching coolant with self-cleaning function provided by the present invention comprises 85-95% of a carrier matrix by mass percentage. In the present invention, the carrier matrix preferably comprises water, more preferably tap water or distilled water. As one embodiment of the present invention, the mass percentage of the carrier matrix can be 88%, 89%, 90%, 91%, 92%, 92.29%, 93% or 94%. By using water as the carrier matrix, the present invention not only allows the various components to be mixed evenly therein, but also acts as a coolant, reducing the temperature of the aluminum can during the thinning and stretching process to prevent the temperature from being too high.

[0028] In terms of mass percentage, the stretching coolant with self-cleaning function provided by the present invention includes 0.5 to 2.5% of a coupling agent. In the present invention, the coupling agent preferably includes dimethyl sulfoxide, N-methylpyrrolidone, dimethylformamide or dimethylacetamide, more preferably dimethyl sulfoxide. As an embodiment of the present invention, the mass percentage of the coupling agent can be 0.8%, 1.0%, 1.2%, 1.5%, 1.8%, 2.0% or 2.2%. By adding a coupling agent, the present invention can regulate the interface and enhance the stability of the system. At the same time, the coupling agent molecules can also be adsorbed on the metal surface to form a directional lubricating film, reducing the direct friction between the tool and the workpiece, thereby improving the lubrication performance.

[0029] In terms of mass percentage, the stretching coolant with a self-cleaning function provided by the present invention includes 0.05 to 0.2% of an adamantane derivative. In the present invention, the adamantane derivative is preferably a carboxyl adamantane derivative, more preferably 3-hydroxyadamantane-1-carboxylic acid. As an embodiment of the present invention, the mass percentage of the 3-hydroxyadamantane-1-carboxylic acid in the stretching coolant with a self-cleaning function can be 0.08%, 0.1%, 0.12%, 0.15% or 0.18%. In the present invention, the carboxyl group of the adamantane derivative can enhance the adsorption capacity of the molecule on the metal surface, and can form a boundary lubricating film after compounding with a lubricant.

[0030] The stretching cooling liquid with self-cleaning function provided by the present invention comprises 0.5 to 3.0% of lubricant by mass percentage. In the present invention, the lubricant preferably comprises an aqueous oxidized polyethylene wax emulsion, more preferably Aquaslip produced by Lubrizol. TM 5071. As one embodiment of the present invention, the mass percentage of the aqueous oxidized polyethylene wax emulsion can be 0.8%, 1.0%, 1.2%, 1.5%, 1.8%, 2.0%, 2.2%, 2.5%, or 2.8%. By using a lubricant, the present invention can significantly enhance the lubrication effect of the self-cleaning stretching coolant, thereby reducing the adhesion of residues and further removing them.

[0031] The stretching coolant with a self-cleaning function provided by the present invention includes 0.05-0.2% of a rust inhibitor by mass. In the present invention, the rust inhibitor is preferably a water-soluble siloxane ketone corrosion inhibitor. As one embodiment of the present invention, the rust inhibitor can be sourced from Notai Biotechnology, with the brand name NEUF815. As one embodiment of the present invention, the rust inhibitor can be 0.08%, 0.1%, 0.12%, 0.15%, or 0.18% by mass. By using the above-mentioned rust inhibitor, the present invention can improve the rust prevention effect of the stretching coolant.

[0032] The self-cleaning stretching coolant provided by the present invention comprises 0.1 to 2.0% by mass of a complexing agent. In the present invention, the complexing agent is preferably sodium polyacrylate, more preferably sodium polyacrylate with an average molecular weight of 4,000 to 6,000. In one embodiment of the present invention, the mass percentage of the complexing agent can be 0.2%, 0.3%, 0.5%, 0.8%, 1.0%, 1.2%, 1.5%, or 1.8%. By adding a complexing agent, the present invention can complex and remove various impurities generated during the stretching process of the can, thereby further improving the self-cleaning performance of the stretching coolant.

[0033] In terms of mass percentage, the stretching cooling liquid with a self-cleaning function provided by the present invention includes 0.5 to 4.0% of a builder. In the present invention, the builder is preferably a basic amino acid, more preferably any one or more of lysine, arginine and histidine. As an embodiment of the present invention, the mass percentage of the builder can be 0.8, 1.0%, 1.2%, 1.5%, 1.8%, 2.0%, 2.2%, 2.5%, 2.8%, 3.0%, 3.2%, 3.5% or 3.8%. By adding the above-mentioned builder, the present invention can improve the self-cleaning function of the stretching cooling liquid and further remove residues during the thinning and stretching process of the can.

[0034] The self-cleaning stretching coolant provided by the present invention comprises 0.05-1.0% by mass of a bactericide. In the present invention, the bactericide is preferably a nanosilver solution; the nanosilver particle size in the nanosilver solution is preferably 10-15 nm; and the concentration of the nanosilver solution is preferably 500-2000 ppm. As one embodiment of the present invention, the mass percentage of the bactericide can be 0.08%, 0.1%, 0.15%, 0.2%, 0.25%, 0.3%, 0.35%, 0.4%, 0.45%, 0.5%, 0.55%, 0.6%, 0.65%, 0.7%, 0.75%, 0.8%, 0.85%, 0.9%, or 0.95%; and the concentration of the nanosilver solution can be 800 ppm, 1000 ppm, 1200 ppm, 1500 ppm, or 1800 ppm. The present invention can achieve a sterilization effect by adding a bactericide, thereby reducing the bacterial content on the surface of the can.

[0035] In terms of mass percentage, the stretching coolant with self-cleaning function provided by the present invention includes 0.6 to 3.0% of emulsifier. In the present invention, the emulsifier preferably includes a polyoxyethylene ether emulsifier, more preferably tallow amine polyoxyethylene ether (EO=10) and oleyl alcohol polyoxyethylene ether (EO=23). In the present invention, the tallow amine polyoxyethylene ether is preferably derived from Syensqo; the oleyl alcohol polyoxyethylene ether is preferably derived from Clariant (Clariant Masterbatch (Shanghai) Co., Ltd.). In the present invention, when the emulsifier is tallow amine polyoxyethylene ether and oleyl alcohol polyoxyethylene ether, the mass percentage of the tallow amine polyoxyethylene ether in the stretching coolant with self-cleaning function is preferably 0.1 to 1.0%; the mass percentage of the oleyl alcohol polyoxyethylene ether in the stretching coolant with self-cleaning function is preferably 0.5 to 2.0%. As an embodiment of the present invention, the mass percentage of the emulsifier can be 0.8%, 1.0%, 1.2%, 1.5%, 1.8%, 2.0%, 2.2%, 2.5% or 2.8%; the mass percentage of the tallow amine polyoxyethylene ether in the stretching coolant with a self-cleaning function can be 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8% or 0.9%; the mass percentage of the oleyl alcohol polyoxyethylene ether in the stretching coolant with a self-cleaning function can be 0.8%, 1.0%, 1.2%, 1.5% or 1.8%. The present invention can stabilize the system by adding an emulsifier, so that the various components form a uniform and stable system in the carrier matrix, ensuring that uniformity is maintained during subsequent use. At the same time, the emulsifier can also play a certain lubricating effect and further remove residues.

[0036] In terms of mass percentage, the stretching coolant with self-cleaning function provided by the present invention includes 0.005-0.02% of a defoaming agent. In the present invention, the defoaming agent is preferably a silicone defoaming agent, more preferably Foamban HP990 produced by Mengqingxin Additive Trading (Shanghai) Co., Ltd. As an embodiment of the present invention, the mass percentage of the defoaming agent can be 0.008%, 0.01%, 0.012%, 0.015% or 0.018%. By adding a defoaming agent, the present invention can eliminate bubbles generated during the thinning and stretching process of aluminum cans, thereby further reducing the content of residues.

[0037] In the stretching coolant with self-cleaning function provided by the present invention, the coupling agent, the adamantane derivative and the lubricant cooperate with each other to significantly improve the lubrication performance of the stretching coolant, thereby reducing the adsorption of residues on the surface of the can. The addition of the complexing agent can complex the residues into the stretching coolant and remove them as the stretching coolant is removed; the emulsifier can play a role in stabilizing the system, so that the various components form a uniform and stable system in the carrier matrix, ensuring that the uniformity is maintained during subsequent use. At the same time, the emulsifier can also play a certain lubricating effect, further removing the residues; the detergent can improve the self-cleaning function of the stretching coolant, and further remove the residues in the thinning and stretching process of the can; by adding the defoaming agent, bubbles can be quickly eliminated, thereby improving the removal efficiency of the residues; the rust inhibitor can enable the stretching coolant to improve the rust prevention performance of the metal matrix, thereby improving its surface quality, and the bactericide can improve the bactericidal performance of the stretching coolant; after optimizing the components, the cleaning process in the can processing process can be eliminated, effectively reducing production costs, improving production efficiency, reducing wastewater discharge, and being more energy-saving and environmentally friendly.

[0038] The present invention also provides a method for preparing the stretching coolant with self-cleaning function described in the above technical solution, comprising the following steps:

[0039] (1) mixing a carrier matrix, a coupling agent, an adamantane derivative, a rust inhibitor, a complexing agent, and a builder to obtain a mixed solution;

[0040] (2) The mixed liquid obtained in step (1), a lubricant, a bactericide, an emulsifier and a defoaming agent are mixed to obtain a stretching cooling liquid with a self-cleaning function.

[0041] The invention mixes a carrier matrix, a coupling agent, an adamantane derivative, a rust preventive, a complexing agent and a builder to obtain a mixed liquid.

[0042] In the present invention, the mixing temperature is preferably 55 to 70°C, more preferably 60 to 65°C; the mixing time is preferably 60 to 120 min, more preferably 70 to 110 min, and further preferably 80 to 100 min; and the mixing is preferably carried out in a reactor. In the present invention, the mixing is preferably carried out under stirring conditions. The present invention has no special restrictions on the stirring rate, as long as the components are mixed evenly. The present invention has no special restrictions on the specific model and source of the reactor, and a commercially available reactor familiar to those skilled in the art can be used. By controlling the mixing temperature, the present invention can fully and evenly mix the components in the carrier matrix.

[0043] In the present invention, the carrier matrix, coupling agent, adamantane derivative, rust inhibitor, complexing agent, and builder are preferably mixed by first heating the carrier matrix, then adding the coupling agent, adamantane derivative, rust inhibitor, complexing agent, and builder, and mixing. The present invention does not particularly limit the temperature and time of heating, as long as the carrier matrix reaches the mixing temperature. By employing this mixing method, the uniformity of the mixing of the components can be further improved.

[0044] After obtaining the mixed liquid, the present invention mixes the mixed liquid, a lubricant, a bactericide, an emulsifier and a defoaming agent to obtain a stretching cooling liquid with a self-cleaning function.

[0045] In the present invention, the temperature of mixing the mixed liquid, lubricant, bactericide, emulsifier and defoamer is preferably 40-50° C., more preferably 45° C. By controlling the mixing temperature, the present invention can avoid the influence of excessively high temperature on the homogeneity, thereby improving the uniformity of the stretching coolant with a self-cleaning function.

[0046] In the present invention, the mixed liquid, lubricant, bactericide, emulsifier and defoamer are preferably mixed in the following manner: the mixed liquid and lubricant are mixed and then stirred for the first time, then the bactericide and emulsifier are added and stirred for the second time, and finally the defoamer is added and stirred for the third time to obtain a stretching cooling liquid with a self-cleaning function. In the present invention, the time for the first stirring is preferably 20 to 50 minutes, more preferably 30 to 40 minutes; the time for the second stirring is preferably 30 to 60 minutes, more preferably 40 to 50 minutes; the time for the third stirring is preferably 20 to 50 minutes, more preferably 30 to 40 minutes. The present invention does not have any special restrictions on the stirring rates of the first stirring, second stirring and third stirring. They are determined according to the technical common sense of those skilled in the art, as long as the components can be mixed evenly.

[0047] After obtaining the stretching cooling liquid with a self-cleaning function, the present invention preferably further comprises cooling the stretching cooling liquid with a self-cleaning function to room temperature. The present invention has no particular limitation on the specific method of cooling the liquid to room temperature, and natural cooling or water cooling may be used.

[0048] The preparation method provided by the present invention is simple and only requires controlling the temperature and uniformly mixing the components. No large-scale equipment is required, which is conducive to large-scale industrial production and promotion.

[0049] The present invention also provides the use of the stretching cooling liquid with self-cleaning ability described in the above technical solution or the stretching cooling liquid with self-cleaning ability prepared by the preparation method described in the above technical solution in the production process of cans.

[0050] In the present invention, the application method is preferably: first dilute the stretching coolant with self-cleaning ability to obtain a dilution with a mass concentration of 1.5 to 3.5% (that is, 100 g of the dilution contains 1.5 to 3.5 g of the stretching coolant with self-cleaning ability), and then add the dilution during the stretching process of the can.

[0051] Figure 1 The figure is a schematic diagram of the process flow of the can preparation process. Figure 1 It can be seen that the raw aluminum coil is prepared by cupping, stretching, cleaning, film forming and subsequent multiple processes in sequence, and the stretching coolant with self-cleaning ability provided by the present invention is added during the stretching process.

[0052] Figure 2 The figure is a schematic diagram of the cleaning process when using conventional stretching coolant available on the market. Figure 2 It can be seen that when using conventional stretching coolant, after stretching, pre-cleaning and cleaning are required before rinsing, film forming and other processes can be carried out.

[0053] Figure 3 This is a schematic diagram of the cleaning process when using the stretching coolant provided by the present invention. Figure 3 It can be seen that when the stretching cooling liquid provided by the present invention is used, after the stretching is completed, there is no need to perform pre-cleaning and cleaning processes, and rinsing and film forming processes can be directly carried out. In this way, not only the production process is simplified, but also the generation of a large amount of wastewater can be prevented, costs can be saved, and the environment can be protected.

[0054] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions of the present invention. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0055] Example 1

[0056] A stretching coolant with a self-cleaning function, comprising the following components by mass percentage: 92.29% of a carrier matrix, 1.5% of a coupling agent, 0.1% of an adamantane derivative, 1.5% of a lubricant, 0.1% of a rust inhibitor, 0.5% of a complexing agent, 2.0% of a builder, 0.5% of a bactericide, 1.5% of an emulsifier, and 0.01% of a defoaming agent;

[0057] The carrier matrix is ​​tap water; the coupling agent is dimethyl sulfoxide; the adamantane derivative is 3-hydroxyadamantane-1-carboxylic acid; the lubricant is an aqueous oxidized polyethylene wax emulsion (Aquaslip TM 5071); the rust inhibitor is a silicone ketone water-soluble corrosion inhibitor, sourced from Notai Bio, with the brand name NEUF815; the chelating agent is sodium polyacrylate with an average molecular weight of 5000; the builder is lysine; the bactericide is a nanosilver solution, the particle size of the nanosilver is 10-15 nm, and the concentration of the nanosilver solution is 1000 ppm; the emulsifier is tallow amine polyoxyethylene ether (EO=10) (sourced from Syensqo) and oleyl alcohol polyoxyethylene ether (EO=23) (sourced from Clariant), the mass percentage of tallow amine polyoxyethylene ether in the stretching coolant with self-cleaning function is 0.5%, and the mass percentage of oleyl alcohol polyoxyethylene ether in the stretching coolant with self-cleaning function is 1.0%; the defoamer is a silicone defoamer, sourced from Foamban HP990 of Mengqingxin Additive Trading (Shanghai) Co., Ltd.

[0058] The method for preparing the stretching coolant with self-cleaning function comprises the following steps:

[0059] (1) The carrier matrix is ​​first heated to 60° C. in a reaction kettle, and then a coupling agent, an adamantane derivative, a rust inhibitor, a complexing agent, and a detergent are added and stirred for 80 minutes to obtain a mixed solution;

[0060] (2) The mixed solution obtained in step (1) is cooled to 45° C., a lubricant is added and stirred for an initial period of 30 minutes, a fungicide and an emulsifier are then added and stirred for a second period of 40 minutes, and a defoaming agent is finally added and stirred for a third period of 30 minutes to obtain a stretching cooling liquid with a self-cleaning function, which is then naturally cooled to room temperature for use.

[0061] Comparative Example 1

[0062] Commercially available - UNICOAT CL377 drawing coolant.

[0063] The conventional physical and chemical indicators of the stretching coolant provided in Example 1 and Comparative Example 1 were tested, and the results are shown in Table 1:

[0064] Table 1 General physical and chemical indicators of the stretching cooling liquid provided in Example 1 and Comparative Example 1

[0065] Test items Test standards Example 1 Comparative Example 1 Appearance Visual inspection Light yellow clear liquid Light yellow clear liquid pH of 5% dilution ASTM D1287 10.21 9.98 <![CDATA[Density (25 °C) g / cm 3 > ASTM D4052 1.03 1.02 Total base value mgNaOH / g ASTM2896 90.6 91.5

[0066] It can be seen from Table 1 that the conventional indicators of the stretching coolant provided by the present invention are relatively close to those of conventional stretching coolants currently available on the market.

[0067] The lubricant load-bearing capacity determination method (four-ball machine method) was used to test the lubricating properties of the stretching coolants provided in Example 1 and Comparative Example 1. During the test, the speed was 1450 RPM and the running time was 10 s. The results are shown in Table 2:

[0068] Table 2 Lubricating properties of the stretching coolants provided in Example 1 and Comparative Example 1

[0069] Test standards Example 1 Comparative Example 1 GB / T3142 44 40

[0070] It can be seen from Table 2 that the lubricating performance of the stretching coolant provided by the present invention is significantly improved compared with the conventional stretching coolant currently available on the market, which can ensure the smooth stretching process of the cans during application.

[0071] The foaming performance (foaming property) of the stretching coolant provided in Example 1 and Comparative Example 1 was tested. The test method was as follows: 2 g of the stretching coolant was placed in a 100 mL stoppered graduated cylinder, 98 g of deionized water was added to obtain a dilution with a mass concentration of 2%, and the 100 mL stoppered graduated cylinder was placed in a 60°C oven for 4 hours to allow the temperature of the dilution to reach 60°C, which is consistent with the field use temperature. After that, the cylinder was taken out, and the bottom and top of the stoppered graduated cylinder were held tightly with both hands, and the cylinder was shaken vigorously up and down for 30 seconds. The cylinder was placed on a table and the foam height was recorded. The results are shown in Table 3:

[0072] Table 3 Foamability of the stretching cooling liquid provided in Example 1 and Comparative Example 1

[0073] Example 1 Comparative Example 1 Foam height / mL 15 20

[0074] It can be seen from Table 3 that, under the same conditions, the stretching coolant provided by the present invention generates fewer bubbles, which can reduce the adhesion of residues.

[0075] The defoaming performance of the stretching coolant provided in Example 1 and Comparative Example 1 was tested. The test method was as follows: 2 g of the stretching coolant was placed in a 100 mL stoppered graduated cylinder, 98 g of deionized water was added to obtain a dilution with a mass concentration of 2%, and the 100 mL stoppered graduated cylinder was placed in a 60 ° C oven for 4 hours to make the temperature of the dilution reach 60 ° C, which is consistent with the on-site use temperature. After that, it was taken out, and the bottom and top of the graduated cylinder were held tightly with both hands, and shaken up and down vigorously for 30 seconds. It was placed on the table and the time for the foam to disappear was recorded (the foam height was less than 3 mL and the foam was considered to have disappeared). The results are shown in Table 4:

[0076] Table 4 Defoaming properties of the stretching cooling liquid provided in Example 1 and Comparative Example 1

[0077] Example 1 Comparative Example 1 Foam time / s 35 60

[0078] It can be seen from Table 4 that, under the same test conditions, the bubble elimination time generated by the stretching coolant provided by the present invention is much shorter than that of the conventional stretching coolant currently available on the market. This is beneficial for eliminating residues during the stretching process of the cans.

[0079] The anti-rust performance of the stretching coolant provided in Example 1 and Comparative Example 1 on iron products was tested. The test results are shown in Table 5. The test method is:

[0080] 1) Place a Petri dish containing filter paper on the scale pan. Then, weigh 2.0 ± 0.1 g of metal particles (special iron filings DIN 51360) and pour them into the Petri dish, spreading them as evenly as possible on the surface of the filter paper to obtain the metal particles to be tested.

[0081] 2) adding 2 g of the tensile coolant to be tested to the metal particles obtained in step 1) to ensure that the metal particles are all wetted, then closing the culture dish and storing it in a dark place at a temperature between 18 and 28° C. for 2 hours;

[0082] 3) Remove the filter paper from the culture dish, rinse it under running tap water to remove metal particles, and observe the rust on the filter paper.

[0083] Table 5 Antirust performance of the stretching coolant provided in Example 1 and Comparative Example 1 on iron products

[0084] Example 1 Comparative Example 1 Rust resistance grade Level 0 Level 1

[0085] In the rust prevention grade, level 0 is no rust, level 1 is 1 to 3 rust spots, level 2 is 1% of the area rusted, level 3 is 1 to 5% of the area rusted, and level 4 is more than 5% of the area rusted.

[0086] It can be seen from Table 5 that, compared with conventional drawing coolants currently available on the market, the drawing coolant provided by the present invention can significantly improve the rust resistance of iron products.

[0087] The anti-rust performance of the stretching coolant provided in Example 1 and Comparative Example 1 on aluminum products was tested. The test method was as follows: the fresh surface of the aluminum sheet (3104H19) was polished, placed in a 2% dilution, and the surface color difference was observed. The test results are shown in Table 6:

[0088] Table 6 Antirust performance of the stretching coolant provided in Example 1 and Comparative Example 1 on aluminum products

[0089] Example 1 Comparative Example 1 Surface color difference dE 2.8 2.9

[0090] As can be seen from Table 6, the anti-rust performance of the stretching coolant provided by the present invention on aluminum products is similar to that of conventional stretching coolants currently available on the market.

[0091] The self-cleaning performance of the stretching coolant provided in Example 1 and Comparative Example 1 was tested, and the results obtained are shown in Table 7. The test method is:

[0092] I. Material preparation:

[0093] The simulated grease used in the experiment is used to simulate the grease on the surface of the can. The preparation of the simulated grease for the experiment is as follows: pre-coating oil is brand UNICOAT PL9611, cupping lubricant UNICOAT CP360 and mineral oil 250SN. The three are stirred and mixed at a mass ratio of 3:2:2 at 40°C for 30 minutes, and then cooled to obtain the simulated grease for the experiment;

[0094] The simulated plate used in the experiment is QPanelAl standard plate TypeA (3003H14), which is used to simulate aluminum alloy material;

[0095] II. Preparation of the sample to be cleaned:

[0096] Apply the experimental simulated grease on the experimental simulated plate, and the oil film thickness is controlled to 800mg / m 2 , static aging in a 40℃ oven to simulate the surface of the can to be cleaned in actual conditions, and obtain the sample to be cleaned;

[0097] III. Self-cleaning ability test:

[0098] Prepare a 2% concentration of the stretching coolant, heat it to 60°C, start stirring, and immerse the sample to be cleaned prepared in step II in the stretching coolant solution. Take it out every 10 seconds to observe the water film until the water film is completely continuous. Record the time required. The shorter the time, the better the self-cleaning ability of the stretching coolant. If the water film is still not completely continuous after more than 180 seconds, stop the test, indicating that the stretching coolant does not have self-cleaning ability.

[0099] Table 7 Self-cleaning performance of the stretching coolant provided in Example 1 and Comparative Example 1 on aluminum products

[0100] Example 1 Comparative Example 1 Self-cleaning time / s 30 ＞180

[0101] As can be seen from Table 7, the stretching coolant provided by the present invention can complete self-cleaning in only 30 seconds, while the conventional stretching coolant currently available on the market cannot achieve self-cleaning even after 180 seconds, indicating that the stretching coolant provided by the present invention has excellent self-cleaning performance.

[0102] Example 2

[0103] A stretching coolant with a self-cleaning function, comprising the following components by mass percentage: 89.68% of a carrier matrix, 1.5% of a coupling agent, 0.15% of an adamantane derivative, 2.5% of a lubricant, 0.05% of a rust inhibitor, 0.5% of a complexing agent, 2.5% of a builder, 0.6% of a bactericide, 2.5% of an emulsifier, and 0.02% of a defoaming agent;

[0104] The emulsifiers are tallow amine polyoxyethylene ether and oleyl alcohol polyoxyethylene ether, the mass percentage of the tallow amine polyoxyethylene ether in the stretching coolant with self-cleaning function is 0.5%, and the mass percentage of the oleyl alcohol polyoxyethylene ether in the stretching coolant with self-cleaning function is 2.0%.

[0105] Example 3

[0106] A stretching coolant with a self-cleaning function, comprising the following components by mass percentage: 90.375% of a carrier matrix, 0.5% of a coupling agent, 0.12% of an adamantane derivative, 3.0% of a lubricant, 0.1% of a rust inhibitor, 1.5% of a complexing agent, 1.5% of a builder, 0.1% of a bactericide, 2.8% of an emulsifier, and 0.005% of a defoaming agent;

[0107] The emulsifiers are tallow amine polyoxyethylene ether and oleyl alcohol polyoxyethylene ether, the mass percentage of the tallow amine polyoxyethylene ether in the stretching coolant with self-cleaning function is 0.8%, and the mass percentage of the oleyl alcohol polyoxyethylene ether in the stretching coolant with self-cleaning function is 2.0%.

[0108] The self-cleaning performance of the stretching coolant provided in Examples 2 and 3 was tested, and the test results were the same as above, with the self-cleaning time being less than 35 seconds. This shows that the stretching coolant provided by the present invention has excellent self-cleaning performance.

[0109] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A stretching coolant with self-cleaning function, characterized in that: Calculated by mass percentage, the invention comprises the following components: 85-95% of a carrier matrix, 0.5-2.5% of a coupling agent, 0.05-0.2% of an adamantane derivative, 0.5-3.0% of a lubricant, 0.05-0.2% of a rust preventive, 0.1-2.0% of a complexing agent, 0.5-4.0% of a detergent, 0.05-1.0% of a bactericide, 0.6-3.0% of an emulsifier and 0.005-0.02% of a defoaming agent.

2. The stretching coolant with self-cleaning function according to claim 1, characterized in that: The coupling agent includes dimethyl sulfoxide, N-methylpyrrolidone, dimethylformamide or dimethylacetamide.

3. The stretching coolant with self-cleaning function according to claim 1, characterized in that: The adamantane derivative is a carboxyl adamantane derivative.

4. The stretching coolant with self-cleaning function according to claim 1, characterized in that: The lubricant includes an aqueous oxidized polyethylene wax emulsion.

5. The stretching coolant with self-cleaning function according to claim 1, characterized in that: The rust inhibitor is a silicone ketone water-soluble corrosion inhibitor.

6. The stretching coolant with self-cleaning function according to claim 1, characterized in that: The complexing agent is sodium polyacrylate.

7. The stretching coolant with self-cleaning function according to claim 1, characterized in that: The builder is a basic amino acid.

8. The stretching coolant with self-cleaning function according to claim 1, characterized in that: The emulsifier includes a polyoxyethylene ether emulsifier.

9. The method for preparing the stretching cooling liquid with self-cleaning function according to any one of claims 1 to 8, characterized in that: The following steps are involved: (1) mixing a carrier matrix, a coupling agent, an adamantane derivative, a rust inhibitor, a complexing agent, and a builder to obtain a mixed solution; (2) The mixed liquid obtained in step (1), a lubricant, a bactericide, an emulsifier and a defoaming agent are mixed to obtain a stretching cooling liquid with a self-cleaning function.

10. Use of the stretching cooling liquid with self-cleaning function according to any one of claims 1 to 8 or the stretching cooling liquid with self-cleaning function prepared by the preparation method according to claim 9 in the production process of cans.

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