JP5334463B2 - Lubricant composition for steel and method for producing steel cord for reinforcing rubber articles using the same - Google Patents

Description

  The present invention relates to a steel lubricant composition and a method for producing a steel cord for reinforcing rubber articles using the same (hereinafter, also simply referred to as “lubricant composition”, “cord” and “production method”). The present invention relates to a steel lubricant composition used in a wet wire drawing process when manufacturing a steel cord for reinforcing rubber articles suitable for reinforcing a tire, and a method for manufacturing a steel cord for reinforcing rubber articles using the same.

  In general, when a steel cord for reinforcing rubber articles plated with brass is wet-drawn using a slip-type multistage wire drawing machine and a wet lubricant, a zinc complex of phosphate ester, etc. is used as the extreme pressure film. By doing so, the friction between the die and the wire at the time of wire drawing is reduced, and damage to the die and the wire is suppressed. This plays a very important role in producing steel cords with high productivity.

  However, in wire drawing to produce high-strength steel wire, the deformation resistance of the steel wire to be processed is high, so the heat generated by the processing increases, and the steel wire deteriorates due to age hardening and promotes die wear. There is a problem that problems such as these are likely to occur.

  As an improved technique related to processing lubricants, for example, Patent Document 1 discloses a lubricating oil composition for plastic processing which contains mineral oil and / or synthetic oil as a base oil and contains a predetermined amount of a predetermined zinc dithiophosphate compound. Patent Document 2 discloses a grease composition containing a lubricating base oil, a predetermined diurea compound, and an organic molybdenum compound in a predetermined ratio.

Patent Document 3 discloses a base oil composed of a mineral oil and / or a synthetic oil having a lubricating oil viscosity, a) an ashless dispersant that is an alkenyl or alkyl succinimide or a derivative thereof, b) a metal-containing detergent, c) zinc dialkyldithiophosphate, d) at least one phosphorus-containing ester selected from the group consisting of phosphate ester, thiophosphate ester, dithiophosphate ester, and phosphite ester, and e) phenol compound, amine compound and molybdenum A lubricating oil composition containing at least one antioxidant selected from the group consisting of compounds in a predetermined ratio is disclosed. Furthermore, Patent Document 4 discloses a lubricating oil composition containing a specific lubricating base oil and at least one selected from the group consisting of an extreme pressure additive and a solid lubricant.
Japanese Patent Laid-Open No. 10-245579 (claims, etc.) Japanese Patent Laid-Open No. 2003-321692 (Claims etc.) JP 2003-336089 A (Claims, [0041], etc.) JP 2007-77312 A (Claims etc.)

  As described above, there are various problems in wet drawing of high-strength steel wires, and further improvements have been demanded.

  In this regard, with respect to the wet lubricant used in wire drawing, the phosphorus (P) compound containing an aromatic group as a lubricant component has excellent heat resistance and heat resistance, and therefore has extremely high extreme pressure and lubricity. It is also known to be excellent. However, until now, it was rarely used in steel cord production. On the other hand, when a steel wire plated with brass using a wet lubricant added with zinc dialkyldithiophosphate was drawn, it became clear that a high ductility value could be obtained in a high-strength steel material. However, when wire drawing is performed using a wet lubricant to which only zinc dialkyldithiophosphate is added, there is a problem in uniformity of the surface of the drawn steel wire, and there is room for further improvement.

  Therefore, the object of the present invention is to improve the above-mentioned problems, have excellent ductility that is harder to break than in the case of wet drawing of high-strength steel wire, and is ductile even if processing such as stranded wire is added. It is an object of the present invention to provide a steel lubricant composition from which a steel cord for reinforcing rubber articles can be obtained, and a method for producing a steel cord for reinforcing rubber articles using the same.

  As a result of intensive studies to achieve the above object, the present inventor contains an organozinc compound and a P compound containing at least one aromatic group as a lubricant composition used in the wet wire drawing process of steel wire. As a result, it was found that a steel cord for reinforcing rubber articles having higher strength and superior ductility than before can be obtained, and the present invention has been completed.

That is, the steel lubricant composition of the present invention is a steel lubricant composition used in a wet wire drawing process of a steel wire.
A dithiocarbamine containing (A) an organic zinc compound and (B) a phosphorus compound containing at least one aromatic group, wherein the (A) organic zinc compound has an alkyl group or an aryl group having 4 to 12 carbon atoms. At least one selected from the group consisting of zinc oxide and zinc dithiophosphate, wherein (B) the phosphorus compound containing at least one aromatic group is mono-, di-, tri-cresyl phosphite, mono- , Di-, tri-cresyl phosphate, mono-, di-, tri-phenyl phosphate or mono-, di-, tri-phenyl phosphate, and (A) an organozinc compound and (B) a phosphorus compound The total amount of is in the range of 0.03 to 3.0% by mass.

  In the lubricant composition of the present invention, the (A) organozinc compound is preferably zinc dialkyldithiophosphate, and the (B) phosphorus compound is preferably tricresyl phosphite. The lubricant composition of the present invention preferably contains (C) a linear nonionic surfactant.

  Moreover, the method for producing a steel cord for reinforcing rubber articles of the present invention includes a step of wet-drawing a brass-plated steel wire using the steel lubricant composition of the present invention. It is.

  According to the present invention, the above configuration provides a steel cord for reinforcing rubber articles that has excellent ductility that is less likely to break than in the past, and that has little reduction in ductility even when processing such as stranded wire is applied. It is possible to realize a steel lubricant composition and a method for producing a steel cord for reinforcing rubber articles using the steel lubricant composition.

Hereinafter, preferred embodiments of the present invention will be described in detail.
The steel lubricant composition of the present invention is used in a wet wire drawing process of a steel wire, and comprises (A) an organic zinc compound and (B) a phosphorus compound containing at least one aromatic group. It is characterized in that it is contained simultaneously.

  When the lubricant composition of the present invention is used in the wet wire drawing step of the steel wire by simultaneously containing the (A) organozinc compound and (B) the phosphorus compound containing at least one aromatic group. Due to the synergistic effect of these components (A) and (B), a strong lubricating film is formed between the die and the wire, and it is possible to obtain an effect of suppressing heat generation and reducing friction.

  (A) As an organic zinc compound, specifically, zinc dithiocarbamate and zinc dithiophosphate having an alkyl group or aryl group having 4 to 12 carbon atoms can be suitably used. More preferably, a zinc dialkyldithiophosphate having 4 to 12 carbon atoms is used.

  (B) As phosphorus compounds containing at least one aromatic group, mono-, di-, tri-cresyl phosphite, mono-, di-, tri-cresyl phosphate, mono-, di-, tri-phenyl Examples thereof include phosphite, mono-, di-, tri-phenyl phosphate and the like.

  In the lubricant composition of the present invention, the total amount of the component (A) and the component (B) is preferably in the range of 0.03 to 3.0% by mass. If the total amount of the component (A) and the component (B) is too small, the effect of improving the lubricating performance is poor, and if it is too large, there is a problem in the liquid stability, which is not preferable. Moreover, it is preferable that the compounding ratio of these (A) component and (B) component is 1: 2 to 2: 1 by mass ratio, More preferably, let it be the same ratio.

  Moreover, it is preferable that the lubricant composition of this invention contains (C) linear nonionic surfactant in addition to the said (A) component and (B) component. When the component (A) and the component (B) are dispersed in the lubricant composition, it is important to add a surfactant. Specific examples of the (C) linear nonionic surfactant include polyoxyethylene alkyl ethers and polyoxyethylene alkyl esters. The blending ratio of the component (A) and the component (B) to the component (C) is preferably 2: 8 to 5: 5 by mass ratio.

  In the lubricant composition of the present invention, it is only important that the component (A) and the component (B) are contained, and for the other constituent components, the lubricant composition conventionally used for wet wire drawing. The thing similar to a thing can be used suitably, and it does not restrict | limit in particular. For example, mineral oil, phosphoric acid, phosphate ester, fatty acid, amine, surfactant, rust preventive, preservative and the like can be mentioned.

  In addition, the method for producing a steel cord for reinforcing rubber articles of the present invention may include a step of wet-drawing a brass-plated steel wire using the steel lubricant composition of the present invention. There are no particular restrictions on the manufacturing processes other than the above, the applied code types, and the like. Also for the wet wire drawing process, any wire wire drawing machine that is usually used for wet wire drawing of brass-plated steel wires may be used as long as wet wire drawing is performed according to a conventional method, and there are no particular restrictions on the wire drawing conditions. .

  The drawn steel wire can be used as a monofilament cord or a twisted cord formed by twisting a plurality of wires. In the case of a twisted cord, a steel wire to which the manufacturing method of the present invention is applied and a steel wire to which the production method is not applied may be mixed and used.

Hereinafter, the present invention will be described in more detail with reference to examples.
A wire prepared by subjecting a steel wire made of a high carbon steel wire having a diameter of about 5.5 mm to dry wire drawing repeatedly until the diameter reaches about 1.6 mm, and then performing a patenting process and a brass plating process. On the other hand, the wet drawing was performed in the multi-stage slip type wet drawing machine shown in FIG. 1 until the diameter reached about 0.20 mm. In the figure, the left side is the unwinding part and the right side is the winding part, where 1 is a steel wire, 2 is a drive capstan, 3 is a die, 4 is a final die, and 10 is a lubricating liquid tank. As the wet lubricant, a lubricant composition in which additive components were changed as shown in Table 1 below was used.

  Table 1 below also shows the results of measurement of repeated torsion test values representing ductility for the wire drawn using the lubricant compositions of the examples and comparative examples. There is twist input to the strands at the time of stranded wire, which causes disconnection, but disconnection at the time of stranded wire greatly reduces productivity. Therefore, the twist productivity of the steel wire can be evaluated by performing a repeated twist test. The measurement result of the test value was displayed as an index with Comparative Example 1 as 100. It can be said that the larger the numerical value, the higher the ductility and the better.

＊１）直鎖状ノニオン界面活性剤：ＰＯＥ−アルキルエーテル

* 1) Linear nonionic surfactant: POE-alkyl ether

  From the results of Table 1 above, assuming that the ductility value of the wire of Comparative Example 1 having no additive component is 100, in each of the Examples in which zinc dialkyldithiophosphate and tricresyl phosphite were added, the ductility value was improved. You can see that In particular, when the total amount of zinc dialkyldithiophosphate and tricresyl phosphite is 0.03% by mass or more, the ductility value is clearly improved. On the other hand, even if the total amount of zinc dialkyldithiophosphate and tricresyl phosphite exceeds 3.0% by mass, no further improvement in the ductility value is observed. From these facts, it is preferable to add 0.03% by mass or more of zinc dialkyldithiophosphate and tricresyl phosphite in the lubricant composition, and from the viewpoint of cost reduction, the addition amount It turns out that the upper limit of is 3.0 mass%.

  In addition, as shown in Tables 2 and 3 below, repeated twist test values were measured in the same manner as described above for wires that were drawn using a lubricant composition in which additive components were changed. In addition, as the surfactant in the following table, the same linear nonionic surfactant (POE-alkyl ether) as in the above Table 1 was used. The results are also shown in Tables 2 and 3 below. The measurement results in the following table were expressed as an index with Comparative Example 2 as 100. It can be said that the larger the numerical value, the higher the ductility and the better.

  As shown in the above table, when only tricresyl phosphite is added (Comparative Example 2), even if used in combination with a surfactant, repeated twist test compared to Comparative Example 5 in the case of no addition The value does not improve. In contrast, as shown in Examples 9 to 16, when zinc dialkyldithiophosphate and tricresyl phosphite were used in combination, and a surfactant was used, only zinc dialkyldithiophosphate was added ( Even when compared with Comparative Examples 3 and 4), it can be seen that the repeated torsion test value is improved.

  As described above, when wet-drawing steel wire, as a lubricant composition used in the wire drawing step, by using an organic zinc compound and a phosphorus compound containing at least one aromatic group, It was confirmed that a high ductility value can be obtained in high-strength steel, and that it is effective for increasing the die life and speed.

It is the schematic which shows the multistage slip type wet wire drawing machine used in the Example.

Explanation of symbols

1 Steel wire 2 Drive capstan 3 Die 4 Final die 10 Lubricant bath

Claims (5)

In the steel lubricant composition used in the wet wire drawing process of steel wire,
A dithiocarbamine containing (A) an organic zinc compound and (B) a phosphorus compound containing at least one aromatic group , wherein the (A) organic zinc compound has an alkyl group or an aryl group having 4 to 12 carbon atoms. At least one selected from the group consisting of zinc oxide and zinc dithiophosphate, wherein (B) the phosphorus compound containing at least one aromatic group is mono-, di-, tri-cresyl phosphite, mono- , Di-, tri-cresyl phosphate, mono-, di-, tri-phenyl phosphate or mono-, di-, tri-phenyl phosphate, and (A) an organozinc compound and (B) a phosphorus compound The total amount of is in the range of 0.03 to 3.0 mass%, a steel lubricant composition. The steel lubricant composition according to claim 1, wherein the (A) organozinc compound is zinc dialkyldithiophosphate. The steel lubricant composition according to claim 1 or 2, wherein the phosphorus compound (B) is tricresyl phosphite. (C) Lubricant composition for steel as described in any one of Claims 1-3 containing a linear nonionic surfactant.   A method for producing a steel cord for reinforcing rubber articles, comprising the step of wet-drawing a brass-plated steel wire using the steel lubricant composition according to any one of claims 1 to 4. Method.

Images