JPS6150520B2 - - Google Patents

Description

[Detailed description of the invention]

(Industrial Application Field) The present invention relates to a lubricant for drawing and ironing cans, and more specifically, the present invention relates to a lubricant for drawing and ironing cans. It is used for drawing and ironing at high speeds, has excellent lubricity during drawing and ironing, and is easy to remove the can body formed by drawing and ironing from the ironing punch, that is, stripping. The present invention relates to a lubricant for a squeeze can that can be washed with water alone in the process of washing the lubricant after it has been extracted from a punch. (Prior art) Drawn and ironed cans have no seams around the can body, can be printed on the entire surface, have good appearance characteristics, and have thin side walls, requiring less metal material. Because of these advantages, it is widely used for internal pressure cans such as beer cans and carbonated beverage cans. This drawn and ironed can is manufactured by subjecting the shallowly drawn cup obtained by drawing to several rounds of ironing between an ironing punch and an ironing die. It is essential to supply a lubricant between the metal material and the metal material during processing. Conventionally, this type of lubricant has been made using mineral oil, natural oil type lubricant for ironing cans, mineral oil, rapeseed oil, etc. as a base oil, and various activators and additives added thereto. things have been used. Although these had excellent lubricity when processing tin-plated steel sheets, they had the following drawbacks. The oil evaporated in the form of a mist, staining the area around the machine and on the floor, creating a poor working environment. There was a problem with the cooling effect, and high speed and high productivity could not be obtained. Since it uses a substance that is insoluble in water, it has poor cleaning properties and an alkaline degreasing step is essential. When used for a long period of time, the base oil floated to the surface, causing problems in workability. Stripping properties were poor and there was a problem at the start of work. In addition, as lubricants other than the above-mentioned oil-based lubricants, synthetic oil-type lubricants for drawing and ironing cans made of synthetic esters and salts of fatty acids, such as emulsions of long-chain monoesters or aqueous solutions of oleic acid and alkanolamine salts, etc. are used. It has been. Although some of the problems were resolved, it still had the following drawbacks. It was impossible to wash with water alone, as the water-insoluble substance was simply changed to appear water-soluble by the power of additives. During long-term use, water-insoluble substances gradually surfaced, making it impossible to continuously produce high-quality cans. Stripping properties were poor and there was a problem at the start of work. (Problems to be Solved by the Invention) It is an object of the present invention that the components used are water-soluble or water-dispersible, and that they are in the form of an aqueous composition during can manufacturing by drawing and ironing a metal material, particularly a tin-plated steel plate. It is used for lubrication and has excellent lubricity during drawing-ironing processing at high speeds, and it is easy to remove the can body formed by drawing-ironing processing from the ironing punch, that is, stripping. To provide a lubricant for a drawing and ironing can that can be washed with water alone in the step of washing the lubricant after being extracted from a punch. (Means for Solving the Problems) That is, according to the present invention, a polyalkylene polyol and a monobasic fatty acid (hereinafter simply referred to as fatty acid)
and polyethylene glycol and ethylene oxide/propylene oxide copolymers with a molecular weight of 3,000 or more.
20000 polyalkylene polyol from 5:95 to
A lubricant for drawing and ironing cans is provided which is characterized by comprising a water-soluble or dispersible composition containing a water-soluble or dispersible composition in a weight ratio of 95:5 and which has excellent lubricity during processing, stripping property, and water washability. (Function) The lubricant of the present invention is characterized in that it is composed of a water-soluble or water-dispersible composition containing an ester of a polyalkylene polyol and a fatty acid and a polyalkylene polyol. That is, this composition is diluted with water in the form of an aqueous solution or an aqueous dispersion,
When used for lubrication during drawing and ironing of tin-plated steel sheets, significant advantages are achieved which are detailed below. First, due to the boundary lubricity of the ester compound, which is the main component, and the fluid lubricity due to the thickening effect of the polyalkylene polyol, a harmonious mixed lubrication state can be obtained, and the amount of heat generated during processing can be suppressed.
Further, the composition itself exists in a state dissolved in water, and has a particularly excellent cooling effect, and can prevent a rise in temperature during molding. Furthermore, due to the low increase in viscosity at high pressure, which is a characteristic of ester compounds and polyalkylene polyols, excessive shearing force is not required to break the oil film during stripping compared to mineral-based products, which solves the problem of stripping. can. As described above, various drawbacks of conventional lubricants can be solved. Since all the ingredients are water-soluble and water-dispersible substances, it has excellent washability and can be completely degreased with just water. For the above reasons, no oil floats to the surface, allowing stable molding for a long period of time. It has excellent stripping properties, eliminates troubles at the start of work, and eliminates the need for a complicated stripping mechanism. It has extremely good cooling properties, allowing high-speed processing and high productivity. In the present invention, as the ester compound, any compound consisting of an ester of a polyalkylene polyol and a fatty acid and having water solubility or water dispersibility can be used without limitation, but suitable examples include: , including but not limited to: Polyethylene glycol preferably molecular weight
400-2000 mono- and diesters with fatty acids. An ester of a fatty acid and a water-soluble polymer obtained by random or block copolymerization of one or both of propylene oxide and butylene oxide and ethylene oxide. Ester of polyoxyethylene sorbitol and fatty acids. Polyalkylene polyols include polyalkylene polyols conventionally used for water-based lubricants, namely polyethylene glycol with a number average molecular weight of 3,000 to 20,000, random or block copolymerization of ethylene oxide and one or both of propylene oxide and butylene oxide. A water-soluble copolymer having a number average molecular weight of 3,000 to 20,000 is used. It goes without saying that each of the above-mentioned ester compounds and polyalkylene polyols can be used alone or in combination of two or more types. In the present invention, the ester compound (A) and the polyalkylene polyol (B) are mixed in a ratio of A:B=5:95.
It is also important to use a weight ratio of between 95:5 and especially between 20:80 and 80:20. That is, ester compound (A)
Compared to the case of using it alone or the case of using polyalkylene polyol (B) alone, by using both in the above-mentioned quantitative ratio, Table 2 described below
As shown in Table 3, a synergistic improvement in lubrication performance is obtained, and as shown in Table 3 below, a dramatic improvement in stripping performance is achieved. As long as the lubricant for drawing and ironing cans of the present invention contains the above two components as essential components, satisfactory results can be obtained in terms of lubricity, stripping performance, and water washability, but the purpose is to further improve the lubrication performance. In this case, it is desirable to add a lubricant improver, and to control the tendency of rust formation during or after processing, it is desirable to add a rust preventive additive and/or a corrosion inhibitor. Oiliness improvers include alkanolamides and alkylamides of mono- and dicarboxylic acids, alkali metal salts (Na, K) of alkyl phosphates, alkylamine salts, alkanolamine salts and ammonium salts, alkyl or allyl polyoxyethylene,
Examples include phosphoric acid esters alone or salts, alkali metal (Na/K) alkylamine salts, alkanolamine salts, and ammonium salts of mono-, di-, and tricarboxylic acids, and the above-mentioned ester compounds improve oiliness. It also acts as a drug. In addition, as antirust additives and/or corrosion inhibitors, boric acid, silicic acid, phosphoric acid alone or alkali metal salts, alkylamine salts, alkanolamine salts and ammonium salts, mercaptobenzothiazole, benzotriazole alone or Salts thereof, alkanolamines, alkanolamides, alkylamides, salts of benzoic acid, resin acids, etc., salts of alkyl or arylsulfonic acids, etc. can be mentioned. It is desirable that the oiliness improver is contained in the aqueous composition in an amount of 0.01% by weight or more, and the rust preventive additive or corrosion inhibitor is contained in the composition in an amount of 0.01% by weight or more. The lubricant composition of the present invention may contain any other compounding agents or regulators, if necessary. Conditioners include water-soluble anti-bacterial agents/bactericides (e.g., triazine, carbolic acid, morpholine, formalin) for long-term use, antifoaming properties, and long-term product stability. alcohols/glycols (e.g. methanol, ethanol, butanol/ethylene glycol, diethylene glycol, glycerin), non-ionic active agents (e.g. POE alkyl ether, POE alkyl phenol ether) to improve wetting and permeability, water quality Metal ion sequestering agents (eg, soda salt of EDTA), etc., can be mentioned. The lubricant of the present invention is used in the drawing-iron process of tin-plated steel sheets in the form of an aqueous composition diluted with water; It can be supplied to can manufacturers in the form of a concentrated aqueous solution or a diluted aqueous solution to customers. The lubricant composition of the present invention, in the form of a diluted aqueous solution used in drawing and ironing, generally has a
It is desirable to have a nonvolatile content concentration of 30% by weight, especially 0.5 to 15% by weight, and in order to obtain the above-mentioned desired combination of lubricity and stripping properties, the ester compound should be at least 0.01% by weight, especially 0.10% by weight.
In the above amount, polyalkylene polyol
It is preferably contained in an amount of 0.1% by weight or more, particularly 0.5% by weight or more. Further, it is desirable to use the oiliness improver in an amount of 0.01% by weight or more, and the rust preventive additive or corrosion inhibitor in an amount of 0.01% by weight or more. On the other hand, if the concentration of nonvolatile components is higher than the above range, it will be disadvantageous both in terms of cooling performance and economic efficiency. This diluted aqueous lubricant solution can be sprayed, immersed, or sprayed onto a punch, die, or can body through a nozzle or the like during drawing and ironing of tin-plated steel sheets.
Perform desired lubrication and cooling operations. The can body after processing is
As already mentioned above, it is easy to remove from the punch and also easy to wash with water. Furthermore, the present invention has the additional advantage that a high degree of ironing is possible at high production rates. (Examples) Example 1 A water-based lubricant having the formulation shown in Table 1 below was prepared. The following tests were conducted on this water-based lubricant.
The results shown in Table 1 were obtained. The test method is as follows. Formability and Stripping Properties (1) Cup Formability Drawing forming was performed under the following conditions using aqueous lubricants having the formulations shown in Table 1. Plate thickness 0.30mm Hardness (Rockwell 30T) 55.0 Amount of tin plating on the surface that should become the outer surface of the can 2.8g/m Among ² cans 〃 〃 2.8 〃 Inner diameter of drawn can 71mm Height of drawn can 34mm Lubricant concentration 10% Aqueous solution Molding speed: Equivalent to a speed of 120 cans/min. (2) Ironing workability The drawing cup formed under the conditions described in (1) above was redrawn using a known ironing device, first stage ironing (plate thickness reduction rate 38.2%), second stage ironing (plate thickness 13.6% reduction rate), 3rd stage ironing (plate thickness reduction rate 39.4%)
%) to form a can with an inner diameter of 52.66 mm, a height of 145.0 mm, a main body thickness of 0.100 mm, and an opening end thickness of 0.160 mm (approximately 20 mm longer than the opening end). Remove it from the ironing punch. The molding speed corresponds to a speed of 200 cans/min. To remove the can body from the ironing punch, a stripper consisting of a large number of claws arranged in a ring is attached to the rear of the attachment part of the final ironing die (in this example, the third stage ironing die). Returning to the position before ironing The opening end of the can body that attaches to the ironing punch and retreats with the punch hits the can body, thereby preventing the can body from retreating, and only the punch returns to the position before ironing. This can be achieved by returning to . (At this time, compressed air may be auxiliary blown onto the bottom of the can body from the tip of the punch.) Cup formability, ironing workability, and stripping property were evaluated as follows. (1) Cup formability The cup could be formed without breaking. 〇 It broke and could not be formed. × (2) Ironing workability The cup could be ironed without any defects. ◎ It could be processed but there were scratches. 〇 It was broken and processed. Not possible × (3) Stripping property The following judgment was made based on the state of buckling of the opening edge of the can after stripping with a stripper.・No buckling at the opening edge of the can ◎ ・Buckling occurs only at the ears of the opening edge of the can and does not reach the valley ○・Buckling occurs at the opening edge of the can A state in which the buckling that has occurred does not reach the trimming line in the next process of trimming △ A state in which the above buckling has reached the trimming line
× Cleanability: 6m/m x 8 specified by JIS G3141
A cold-rolled steel plate of m/m was used. A 10% aqueous solution was prepared and a steel plate was immersed in it for 5 seconds, dried indoors for 5 hours, and used as a test steel plate. Next, it was washed with tap water at 12/min, and evaluated after draining. ◎Completely wet with water
○ 75% or more △ 50-75% × 50% or less Rust prevention: The prepared test steel plate was hung indoors, and the state of rust generation after 24 hours was evaluated. The judgment method was based on JIS K2246. ◎: No rust ○: 10% or more △: 11-25% ×: 26-50% ××: 51% or more

【table】

[Table] Example 2 The blending ratio of polyethylene glycol dilaurate (same ingredients as in Example 1) and polyethylene glycol-polypropylene glycol copolymer (same ingredients as in Example 1) is shown in Table 2 below. The coefficient of friction at a load of 500 pounds (227 kg) was determined using a Farex tester using a 5% aqueous solution of this formulation as a lubricant.
The test method was based on ASTM-D3233 method B. The results obtained are shown in Table 2 below.

[Table] According to the results in Table 2 above, compared to using polyethylene glycol dilaurate () alone or polyethylene glycol-polypropylene glycol () alone (Samples G and M), the ratio of both was 5:95 to 95:5. Weight ratio, especially 20:80 to 80:
It will be appreciated that when used at a weight ratio of 20, a synergistic effect is achieved in which the coefficient of friction can be controlled to a significantly lower value. Example 3 A 1% aqueous solution of each sample shown in Example 2 and a 5% emulsion of E shown in Example 1, which is a conventional product, were used as lubricants for squeezing and ironing, and the extraction load during stripping and the open end of the can were The state of edge buckling was evaluated by the method described below. (1) Cup forming Same as Example 1 (2) Ironing forming Drawing - A load cell to measure the load applied to the punch was attached to the machine for producing ironed cans, and ironing was carried out at a speed of 200 cans/minute, which corresponds to the manufacturing time. I went there. The conditions for re-drawing, first, second, third ironing, and other conditions are the same as in Example 1. Examples of loads measured by the load cell are shown in FIG. 1 (sample E) and FIG. 2 (sample G). In the figure, RD indicates the re-diaphragm areas #1, #2, #3,
ST indicates the first, second, third, and stripping areas, respectively, and P indicates the peak load of stripping. Peak value (P) of stripping load of inventive products I, J, K, comparative products G, M, and conventional product E
Table 3 shows the evaluation results of the buckling state of the can opening edge.

[Table] According to the results in Table 3 above, according to the present invention in which fatty acid ester of polyalkylene polyol and polyalkyline polyol are used in combination, water-based lubricants using either single component (Sample G,
M) and conventional emulsion-based lubricants (sample E)
If it is possible to suppress the stripping load (stripping load) of a drawn and ironed can after forming to a significantly lower value than when using a can opening edge, it is possible to effectively eliminate the occurrence of buckling at the can opening edge. That is clear. Example 3 Sample J of Example 2 (polyethylene glycol
dilaurate: polyethylene glycol/polypropylene glycol copolymer = 50:50), the number average molecular weight is 3000 as a polyethylene glycol/polypropylene glycol copolymer.
A 5% aqueous lubricant was prepared in the same manner as Sample J of Example 2, except that 15,000 and 20,000 were used. The friction coefficient of this water-based lubricant was determined in the same manner as in Example 2 and is shown in Table 4. In addition, for the 1% aqueous solution of each of the above samples, the extraction load during stripping was measured when it was used as a lubricant for drawing and ironing in the same manner as in Example 3, and the evaluation results of the buckling state of the can opening edge were also measured. It is shown in Table 4.

【table】 [Brief explanation of the drawing]

Figures 1 and 2 are diagrams showing the relationship between the punch stroke, forming load, and stripping load during drawing and ironing, and Figure 1 shows the relationship between the punch stroke, forming load, and stripping load during drawing and ironing.
and FIG. 2 show samples using the aqueous lubricant of the present invention (Sample G).

Claims (1)

[Claims] 1 A molecular weight of 3000 to 3000 selected from the group consisting of esters of polyalkylene polyols and monobasic fatty acids, polyethylene glycols, and ethylene oxide/propylene oxide copolymers.
20000 polyalkylene polyol from 5:95 to
Lubricating properties during processing, characterized by comprising a water-soluble or water-dispersible composition containing a weight ratio of 95:5;
A lubricant for drawing and ironing cans with excellent stripping and water washability.