JPS6213398B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a packaging steel strip coated with a rust-preventing lubricant, and by imparting lubricity, packaging work can be made extremely smoothly and the articles to be packed can be prevented from becoming contaminated with the lubricant. The purpose is to provide steel strips that can be made into When goods are packed using steel bands, large friction occurs between the surfaces of the steel bands in the overlapping portions during tightening, making it difficult to perform the tightening process smoothly. Conventionally, in order to solve this problem, a large amount of oil or wax was applied to the steel strip to prevent it from rusting, thereby reducing the friction that occurs between the surfaces of the steel strip during tightening. However, in this case, although the friction can be reduced, the amount of wax applied is too large, and when tightening, The condition was not satisfactory, as it caused the eyes of the knurling to become clogged, or it adhered to the items to be packaged, making them dirty. In particular, when annealed steel plates are cut into strips, carbon called snake carbon, which is often caused by rolling oil, is firmly adhered to both edges of the steel plates. A strip of steel that has been cut from a section creates a very large amount of friction during tightening. Therefore, in order to reduce the friction during tightening, a larger amount of wax is applied, causing more of the aforementioned unsatisfactory conditions. The present invention improves the drawbacks of conventional packaging steel strips, and provides packaging strips coated with a wax emulsion containing 0.1 to 100 parts by weight of hydrophilic silicone oil per 100 parts by weight of wax. It is steel. Next, details of the present invention will be explained together with examples. As the wax used in the present invention, a wide variety of natural and synthetic hydrocarbon waxes, modified products and oxides thereof, mineral and animal waxes, and modified products thereof can be used. Examples of the hydrocarbon wax include paraffin wax, microcrystalline wax, fissure tropism wax, low molecular weight polyethylene, low molecular weight polypropylene, and ethylene-α-olefin copolymer. Mineral waxes include montan wax, and animal and vegetable waxes include carnauba wax, candelilla wax, beeswax, wood wax wax, hardened spermaceti wax, hydrogenated castor oil wax, and hardened beef tallow. These modified products and oxides include Hoechst Wax, Sasol Wax, SK Wax, various metal soaps, amides, oxidized paraffin and its esterified products, oxidized micro and its esterified products, oxidized polyethylene or ethylene-α -Olefin-monoethylenically unsaturated acid copolymer, etc. Among these waxes, wax esters have particularly excellent lubricity. As the hydrophilic silicone oil used in the present invention, modified silicone oils in which various hydrophilic groups are introduced into silicone oil can be used. That is, dimethyl silicone or phenyl methyl silicone alcohol, polyether,
Alternatively, a carboxyl modified product or the like is used. Hydrophilicity here refers to having the property of dissolving or emulsifying in water. In addition to the above-mentioned components, various emulsifiers, water-soluble polymers, rust preventives, etc. used in conventional wax emulsions may be contained, if necessary. A preferred ratio of wax to hydrophilic silicone oil is 0.1 to 100 parts by weight of hydrophilic silicone oil to 100 parts by weight of wax. If the amount of hydrophilic silicone oil is less than 0.1 part by weight, the desired lubrication effect cannot be obtained, and if it exceeds 100 parts by weight, the wettability will deteriorate and it will not adhere uniformly to the steel strip, resulting in a loss of rust prevention effect. descend. The method for producing the wax emulsion used in the present invention is to prepare a wax emulsion by a conventional method, then add hydrophilic silicone oil and mix and stir to form a stable emulsion. The wax emulsion produced is a thick emulsion and is diluted with water to an appropriate concentration before use. The steel strip before applying the wax emulsion used in the present invention is one cut from a cold-rolled steel plate, one cut from a cold-rolled steel plate and blued, and one cut after annealing a cold-rolled steel plate. These include cold-rolled steel sheets that have been annealed, chopped and blued, cold-rolled steel sheets that have been galvanized and then chopped, and hot-rolled steel sheets that have been galvanized and then chopped. The wax emulsion can be applied to these steel strips by any method such as dipping, showering, spraying, or roll coating.
Industrially, the dipping method is effective. In the immersion method, a strip of steel that has been coiled continuously or once after cutting is passed through a wax emulsion bath, and immediately after leaving the bath, it is passed through a wiping device (e.g. (rubber roll, metal roll, felt patch or air blowing device)
The amount of adhesion is adjusted using a dryer, and then the film is dried using a drying device and rolled up. Here, the amount of adhesion to the steel strip can also be adjusted by adjusting the concentration of the wax emulsion. Also, if the temperature of the bath is maintained at 50°C to 60°C, drying efficiency will be improved. The steel strip of the present invention as described above is coated with a wax emulsion containing an appropriate amount of hydrophilic silicone oil, so it has antirust ability and high lubricity. Therefore, the amount of wax emulsion applied can be reduced, and the tightening work during packaging can be done smoothly. It is possible to eliminate the cause of clogging of the rets, and it is also possible to eliminate the problem of wax emulsion adhering to the articles to be packaged and soiling the articles. Next, experimental examples leading up to the present invention will be specifically explained. As shown in Table 1, 7 examples of wax emulsions that correspond to the present invention and 4 comparative examples that do not correspond to the present invention were prepared. Example 1 of the wax emulsion of the present invention is as follows:
5 parts by weight of Carvana wax, 5 parts by weight of microcrystalline wax (melting point 85°C), and 5 parts by weight of polyethylene oxide wax (melting point 90°C) were heated to dissolve and mix, and then 4 parts by weight of morpholine stearate, which is a surfactant, was added. The mixture was added to 81 parts by weight of water at 90°C with stirring, and after cooling to near room temperature, 1 part by weight of hydrophilic silicone oil (manufactured by Dow Corning Co., Ltd.: FSXB-2725) was added while stirring. The emulsion was stirred to form a stable emulsion. Wax emulsions having other compositions listed in Table 1 were also obtained by the same method as above. The steel strip before applying the emulsion is obtained by annealing and cutting cold-rolled steel sheets, and there are two types: the steel strip with carbon attached and the steel strip with no carbon attached. was used. The coating method was to unwind the coiled steel strip and pass it through a bath of emulsions having the compositions shown in Table 1, then use a wiping device to adjust the amount of coating and dry. Tables 2 and 3 show the results of measuring the characteristics of Examples and Comparative Examples of the present invention using wax emulsions corresponding to the numbers in Table 1. Table 2 shows the measurement results of the slip characteristics.The test method was to apply a load (approximately 25 kg) to the strips coated with wax emulsion and dry them in the thrust direction. This figure shows the tensile force at which slipping begins using the tensile method. Regarding the amount of wax emulsion attached,
The test was carried out for two types with a coating weight after drying of 1.0 g/m ² and 0.6 g/m ² . What is shown in Table 3 is the measurement result of rust prevention properties, and the test method is a rust prevention test based on JIS K2246 "Rust preventive oil" 4, 32 "Wet" with a film thickness of 1μ. Here are the measurement results. The present invention is as explained above, and as shown in the measurement results, when the wax emulsion according to the present invention is applied, a low slip value can be obtained with a small coating amount even on steel strips with carbon deposits. Furthermore, it is clear that the anti-rust properties are no better than those of the comparative example, and as mentioned above, the steel strip maintains smooth packing operations and does not stain the packaged products, resulting in a steel strip with high utility value.

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Claims (1)

[Claims] 1. Hydrophilic silicone per 100 parts by weight of wax.
A packaging steel strip coated with a wax emulsion containing 0.1 to 100 parts by weight of oil. 2. Claim 1, wherein the hydrophilic silicone oil is one or more selected from the group consisting of alcohol-modified silicone oil, polyether-modified silicone oil, and carboxyl-modified silicone oil. steel band for packaging. 3. The packaging steel strip according to claim 1 or 2, wherein the wax is wax ester.