JP4140964B2 - Hot rolling oil for aluminum and aluminum alloy, and hot rolling method for aluminum and aluminum alloy using the rolling oil - Google Patents

Description

  The present invention relates to a hot rolling oil for aluminum (including an aluminum alloy, the same applies hereinafter) and a method for hot rolling aluminum using the rolling oil. In particular, the present invention exerts a remarkable effect on the hot rolling of aluminum hot rolling.

  Currently, in hot rolling of aluminum, a rolling oil using a refined mineral oil as a base oil, using oleic acid or esters as an oily agent and an amine soap of oleic acid as an emulsifier is often used.

  When the content of oleic acid or ester is increased, the rolling oil has a high degree of seizure resistance, but there is a problem that the friction is lowered, the biting property is lowered, and slipping occurs during rolling.

As a result of detailed consideration of the characteristics of the conventional hot rolling oil for aluminum, the inventors have obtained the following knowledge regarding hot rolling oil for aluminum having excellent seizure resistance and a high friction coefficient.
(1) The high viscosity rolling oil increases the amount of oil introduced to the friction surface and lowers the friction. Therefore, the viscosity of the rolling oil is limited.
(2) Esters and fatty acids are not used because they enhance boundary lubrication and reduce friction.
(3) Although seizure resistance is imparted with a sulfur-based extreme pressure agent, polar compounds such as sulfurized fats and oils cannot be used because they reduce friction in the same manner as in the case of esters. For this reason, four specific polysulfide-based sulfur extreme pressure agents that reduce friction are used. The specific four types in this case are the following four types of polysulfide. That is, it is at least one polysulfide composed of dibenzoic disulfide (DBDS), t-nonyl polysulfide (TNPS), di-n-octenyl disulfide, and di-t-butyl polysulfide.
(4) The surfactant is changed from a conventional amine soap of oleic acid to an Na-sulfonate type anionic surfactant (hereinafter simply referred to as a sulfonate type anionic surfactant) .

  The present invention has been made on the basis of the above knowledge obtained by the inventors, and its purpose is to provide hot rolling oil for aluminum having seizure resistance, biting property and slip resistance, and the rolling oil. The object is to provide a method for hot rolling aluminum to be used.

  In order to achieve the above object, the hot rolled oil for aluminum according to the present invention comprises 3-20% by mass of polysulfide as a sulfur-based extreme pressure agent (hereinafter the same), 10-35% of a sulfonate type anionic surfactant, and the remainder is a refined mineral oil. This is a basic feature of the configuration.

  Moreover, the hot rolling method for aluminum according to the present invention is characterized in that in hot rolling of aluminum, the hot rolling oil is supplied to a hot rolling mill as a 3 to 10% emulsion, and the rolling roll is cooled and lubricated. It is what.

In the rolling oil of the present invention, refined mineral oil is used as the base oil as in the conventional case. The refined mineral oil may be either a paraffinic mineral oil or a naphthenic mineral oil, and is selected and used so that the viscosity of the rolling oil at a temperature of 40 ° C. is 100 mm ² / s or less so as not to interfere with the combined use with other components. That's fine.

  The present invention is characterized in that a refined mineral oil serving as a base oil contains polysulfide as an extreme pressure agent.

  As polysulfide, compounds represented by R-Sx-R, specifically dibenzoic disulfide (DBDS), t-nonyl polysulfide (TNPS), di-n-octyl disulfide, di-t-butyl polysulfide are used. Is done.

  The preferable content is in the range of 3 to 20%, and if it is less than 3%, the effect of improving seizure resistance is not sufficient, and if it exceeds 20%, the odor becomes remarkable and the viscosity is adjusted to an appropriate range. It becomes difficult.

  In the present invention, the fatty acid / amine type anionic surfactant used in conventional hot rolled oil for aluminum as a surfactant cannot be used because the fatty acid functions as an oily agent and reduces friction. In addition, nonionic surfactants cannot be used in large quantities because it becomes difficult to separate oil and water in waste oil treatment. Therefore, in the present invention, a sulfonate type anionic surfactant is used.

The sulfonate type anionic surfactant used in the present invention, the alkyl or alkenyl sulphone acid Na, Na of AOS (alpha-olefin sulfonate), alkyl benzene sulfonic acid Na, mono- or di (C 3 _{~ 6)} naphthalene sulfonic acid Na , alkyl _{(C 8 ~ 12)} diphenyl ether sulfonate Na, lignin sulfonic acid Na, POE (polyoxyethylene) alkyl _{(C 8 ~ 12)} phenyl ether sulfonate Na or the like is preferably used.

  The preferable content is in the range of 10 to 35%, and if it is less than 10%, the emulsification becomes insufficient, and if it exceeds 35%, the emulsion particle size becomes too fine and the seizure resistance is lost.

  Other conventionally known additives may be added to the rolling oil of the present invention as necessary.

  When the above hot rolling oil for aluminum is used for hot rolling of aluminum and aluminum alloys, the rolling oil is supplied to the roll section of the hot rolling mill as a 3-10% emulsion, and the rolling roll is cooled and lubricated. To do. When the concentration of the emulsion is less than 3%, the seizure resistance becomes insufficient, and when the concentration finally exceeds 10%, the friction is excessively lowered and the biting property is inhibited.

  In the present invention, in the hot rolled oil of aluminum based on refined mineral oil, the friction that is the cause of the decrease in biting property is reduced without using an anionic surfactant such as an oily agent and an amine salt of a fatty acid. Waste oil of used emulsion by using polysulfide with low frictional reduction to give seizure resistance, sulfonate type anionic surfactant with excellent biting and seizure resistance and easy waste oil treatment A hot rolled oil for aluminum having excellent processability can be obtained.

  Hereinafter, the present invention will be described in comparison with examples of the present invention and comparative examples.

  The rolling oil of the present invention comprising the components shown in Table 1 and consisting of the remaining refined mineral oil is mixed with water and used as an emulsion, and an aluminum alloy 3004 alloy plate (plate thickness 5 mm, at a rolling temperature of 500 ° C. and a reduction rate of 80%, A sheet width of 50 mm and a length of 250 mm was hot-rolled to evaluate the seizure resistance of the rolling oil, the biting property at the time of rolling, and the waste oil treatment property. The evaluation results are shown in Table 2. In Table 1, the emulsion concentrations NO1 to NO24 are 7%, NO25 is 3%, and NO26 is 10%.

The refined mineral oil in the rolling oil uses paraffinic mineral oil for tests NO1 to NO12 in Table 1 and naphthenic mineral oil for tests NO13 to NO26, both of which have a viscosity of 40 mm ² / s at 40 ° C. It was adjusted.

(1) Using a rolling mill for seizure resistance and biting test, a rolling test was performed to evaluate the seizure resistance and biting. Test conditions are shown below.

Roll diameter: 150 mmφ, surface roughness (Ra 0.1 μm)
Rolling speed: 10 m / min
Rolled material: Aluminum alloy 3004 alloy plate (plate thickness 5mm, plate width 50mm, length 250mm)
Rolling rate: 80%
Coolant concentration: 3, 7, 10%
Coolant temperature: 60 ° C
Evaluation of seizure resistance; the surface after rolling was observed, and when no seizure flaws were observed, it was considered good.
Evaluation of biting property: The case where biting rolling was carried out stably without problems was regarded as good.

(2) The wastewater treatability test conditions are shown below.
Test oil; concentration 1%, capacity 400ml
Treatment conditions: After adding 250 ppm of sulfuric acid band, the pH is adjusted to 7 with NaOH.
Next, 10 ppm of the polymer flocculant is added, and after standing for 40 min, hydrochloric acid and carbon tetrachloride are added to 300 ml of the lower layer, and the carbon tetrachloride extracted oil content is measured.
Evaluation of wastewater treatment ability: Extracted oil concentration of 100 ppm or less was considered good.

However, the substance symbols in Table 1 are
A: G-tert-butyl polysulfide
B: DBDS (dibenzoic disulfide)
_{M; CnH 2 n- 10 SO 3} Na (n = 25~30)
N: Na salt of diphenyl ether disulfonate As shown in Table 2, all of the hot rolling oils of the present invention exhibit good seizure resistance, biting property, and waste oil processing property.

Comparative Example 1

  As in Example 1, an aluminum alloy 3004 alloy plate (plate thickness 5 mm, plate width 50 mm, length 250 mm) was used, and the rolling oil comprising the components shown in Table 3 and the balance refined mineral oil was mixed with water. Then, it was used as an emulsion and hot-rolled at a rolling temperature of 500 ° C. and a reduction rate of 80% to evaluate the seizure resistance of the rolling oil, the biting property during rolling, and the waste oil processing property. The evaluation results are shown in Table 4.

The refined mineral oil in the rolling oil uses paraffinic mineral oil for tests NO1 to NO4 in Table 3 and naphthenic mineral oil for tests NO5 to NO10, both of which have a viscosity at 40 ° C. of 40 mm ² / s. It was adjusted.

  In Table 3, the emulsion concentrations NO1 to NO8 are 7%, NO9 is 2%, and NO10 is 15%. Also, those that deviate from the conditions of the present invention are underlined.

  As shown in Table 4, since test NO1 and NO5 have a low polysulfide content, test NO4 and NO8 are too stable to emulsify, and test NO9 has a low emulsion concentration, so that seizure resistance is insufficient. Since test NO2 and NO6 have much polysulfide content, an odor becomes a problem. Tests NO3 and NO7 are insufficiently emulsified due to the low content of sulfonate anionic surfactant. Since test NO10 has a high emulsion concentration, the friction is too low and the biting property is hindered.

As described above, according to the present invention, there are provided a hot rolling oil for aluminum excellent in seizure resistance, biting property and waste oil treatment property, and a hot rolling method of aluminum using the rolling oil.

Claims (2)

3-20% by mass of at least one polysulfide composed of dibenzoic disulfide (DBDS), t-nonyl polysulfide (TNPS), di-n-octenyl disulfide and di-t-butyl polysulfide as a sulfur-based extreme pressure agent, Na − A hot rolled oil for aluminum and aluminum alloy, characterized in that the sulfonate type anionic surfactant is 10 to 35% by mass, and the balance is a refined mineral oil.
  In hot rolling of aluminum and aluminum alloy, the hot rolling oil according to claim 1 is supplied to a hot rolling mill as a 3 to 10% emulsion, and the rolling roll is cooled and lubricated. A method for hot rolling of aluminum and aluminum alloys.