JPH08291294A - Coating removal type lubrication treating agent excellent in mold galling, corrosion and blocking resistances and lubrication-treated metallic plate - Google Patents

Abstract

PURPOSE: To obtain a lubrication treating agent capable of forming a lubricating film excellent in any of mold galling, corrosion and blocking resistances and properties of removing coatings on the surface of a metallic plate. CONSTITUTION: (1) This coating removal type lubrication treating agent contains an extender pigment having >=5 and <=50nm particle diameter in an amount of 5-40wt.% based on a nonvolatile component in a flexible binder resin system comprising a water-soluble resin or a water-dispersible resin soluble in an aqueous solution of an alkali and a solid lubricant. Furthermore, (2) the lubrication- treated metallic plate has a film (0.5-5μm film thickness) formed by coating at least one surface of a metallic plate with the lubrication treating agent and drying the treating agent.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a lubricating treatment agent capable of forming a lubricating treatment film on a surface of a metal plate, which has improved mold galling resistance, corrosion resistance and blocking resistance and is excellent in film removal property. And a lubrication-treated metal plate having a lubrication-treated film formed by using this treatment agent.

[0002]

2. Description of the Related Art When a metal plate is subjected to a forming process such as pressing or roll forming, the material is required to have an appropriate lubricity. This is because if the lubricity is too good, there is a problem that the product shape becomes unstable due to slippage of the material, and insufficient lubricity causes breakage of the material.

However, as the product shape becomes complicated, the proper lubricity that one metal plate must have is not uniform, and conventional liquid lubricants are no longer sufficient. Therefore, when such diverse lubricity is required at the same time, a countermeasure is taken to provide a solid lubrication film (hereinafter referred to as "solid lubrication film" or simply "lubrication film") on the metal plate. ing. The lubricating film does not flow like a liquid lubricant even under the high surface pressure that occurs in places where the molding conditions are severe, and at the high surface pressure locations, the lubricant softens due to friction heat and exhibits even higher lubricity. It has, so to speak, a "self-adjusting function of lubricity".

The solid lubricating film includes a "film removal type" film and a "non-film removal type" film. The "removal type" lubricant film is removed after the molding process, and the "non-removal type" lubricant film is not removed even after the process, or is further coated on it. Although used, these days, "corrosion resistance" has improved due to the progress of plating technology, and the demand for bare metal use (use in unpainted state) has increased due to the development of inexpensive stainless steel. There is a trend toward increasing demand for lubricating coatings.

The following proposals have been made as techniques for providing such a film-removing type lubricating film on the surface of a metal plate.

A resin composite solid powder obtained by a method of graft-polymerizing a vinyl monomer on the surface of a lubricating solid powder such as graphite or molybdenum disulfide, alone or as a water-soluble or water-dispersible resin A lubricated metal material applied to a metal plate together.

It has excellent deep drawability, is not slippery during normal handling and is easy to handle, and the coating film can be easily removed by a normal degreasing process (JP-A-57-65795).
Issue).

On a stainless steel plate, a coating layer composed of one or more water-soluble resins such as acrylic resin and melamine resin is used as an underlayer, and, for example, an ester obtained by a reaction between fatty acid and pentaerythritol is used. A stainless steel sheet having a lubricating film provided with an upper layer of a processing lubricant composed of oil and fat, an antioxidant and a lubricant such as wax. Surface scratch resistance and plastic workability can be greatly improved (Japanese Patent Publication No. 55-29819).

A surface treatment agent for metal plastic working comprising a water-soluble resin having a glass transition temperature of 15 to 30 ° C., a water-soluble resin having a glass transition temperature of 60 to 90 ° C., and a solid lubricant having a melting point of 100 ° C. or higher. The lubricating film obtained has good deep drawing workability and the effect of preventing surface scratches from the mold, and it is easy to remove the lubricating film deposited on the mold and has excellent film removal properties (JP-A-54). No. 18462).

[0010]

However, in any of the above-mentioned conventional techniques, since the roughness of the tool surface is transferred to the surface of the metal plate by penetrating the lubricating film during machining, after machining due to galling. The problem of poor appearance occurred. Further, in the metal plate obtained by treating with the above-mentioned lubrication-treated metal material and the surface treatment agent, when the base material is, for example, an iron-based metal plate, the corrosion resistance before processing is insufficient, and further, these While loading and storing the metal plate of No. 3, there was a problem of blocking that the lubricating film was fused between the metal plates in contact with each other.

The present invention has been made in view of such a situation, and an object thereof is to improve mold galling resistance in order to suppress scratches (mold galling) due to contact of a metal plate with a tool during molding. , A film-removal type lubricating treatment agent capable of forming a film-removal type lubricating film which has improved corrosion resistance and is excellent in blocking resistance during storage, and a lubrication having a lubricating film formed by using this treatment agent To provide a treated metal plate.

[0012]

As a result of various studies to solve the above-mentioned problems, the present inventors have added an extender pigment which has not been used in conventional film-removing type lubricating treatment. Was found to be effective. That is, in a lubricating film formed by using a lubricating treatment agent to which an extender pigment is added, a clear increase in adhesion force and an increase in coating film strength are observed, which indicates mold galling resistance, corrosion resistance and blocking resistance. Found to improve. Moreover, the film-removing property does not decrease as the adhesion and strength of the coating film increase.

The present invention has been made on the basis of such knowledge, and the gist thereof is the following film-removing type lubricating treatment agent (1):
And (2) a lubrication-treated metal plate having a lubrication film formed by using this treating agent.

(1) A binder resin system comprising a water-soluble resin or a water-dispersible resin, which is flexible and soluble in an alkaline aqueous solution, and a solid lubricant, and has a particle size of 5 nm or more and 50 n or more.
A film-removing lubricating treatment agent having excellent anti-galling property, corrosion resistance and blocking resistance, characterized in that an extender pigment of m or less is contained in an amount of 5% or more and 40% or less by weight% with respect to a non-volatile component.

(2) A mold-proof anti-galling feature, which comprises a coating having a film thickness of 0.5 μm or more and 5 μm or less formed by applying the lubricant of the above-mentioned (1) and drying it on at least one surface of a metal plate. Lubrication metal plate with excellent corrosion resistance, corrosion resistance and blocking resistance.

The binder resin system mentioned above means a binder resin containing a solid lubricant.

[0017]

The structure and operation of the present invention will be described in detail below.

The invention (1) is a film-removal type lubricating treatment agent in which a binder resin (binder resin system) containing a solid lubricant contains a specific amount of an extender pigment satisfying a predetermined condition.

The particle size of the extender pigment used is required to be 5 nm or more and 50 nm or less. If the particle size of the extender pigment is less than 5 nm, the pigment is likely to aggregate, resulting in poor dispersibility in the binder resin.
This is because when the thickness exceeds nm, the pigment tends to settle, and the stability of the obtained lubricating treatment agent cannot be maintained. Preferably,
It is 10 nm or more and 40 nm or less.

The content of the extender pigment in the lubricating treatment agent is 5% or more by weight% with respect to the non-volatile components of the treatment agent.
% Or less. If the extender pigment concentration is less than 5% by weight, the effect of improving the anti-galling property and the corrosion resistance of the lubricating film formed by using this treatment agent is not recognized,
If it exceeds, cracks will occur in the lubricating film during molding,
The anti-galling property deteriorates.

The type of extender pigment is not particularly limited. For example, SiO ₂ , Al ₂ O ₃ , Sb ₂ O ₅ , ZrO ₅ , T
Oxide-based extender pigments such as iO ₂ , SnO ₂ , Fe ₂ O ₃ , talc and kaolin, carbonates such as CaCO ₃ and BaSO ₄ , and sulfate extender pigments can be used.

In the film-removing type lubricating treatment agent of the present invention, the solid lubricant contained in the binder resin is preferably metal soap. This is because the metallic soap has water repellency, is soluble in an alkaline aqueous solution, and facilitates film removal with an alkali. The wax-based solid lubricant deteriorates the film-removing property (also referred to as degreasing and cleaning property), and the inorganic solid lubricant having a large specific gravity deteriorates the stability of the lubricating treatment agent.

The solid lubricant contained in the binder resin is
0.5% by weight or more with respect to the non-volatile components of the lubricating treatment agent 10
It is desirable that the content be not more than weight%. When the content of the solid lubricant is less than 0.5% by weight, it is difficult to obtain sufficient lubricity, while when it exceeds 10% by weight, the strength of the formed lubricating film is reduced and the mold galling resistance is deteriorated. In addition, foaming tends to deteriorate the coating property of the lubricant.

The binder resin used in the lubricating treatment agent of the present invention is a water-soluble or water-dispersible resin which is soluble in an alkaline aqueous solution so that the lubricating coating formed by this treatment agent has a property of removing the film by alkali. It is necessary to be.
Preferably, a vinyl resin or vinyl copolymer having a carboxyl group having an acid value of 10 or more and 160 or less,
Alternatively, an esterified product or an amidated product of these resins, which have good film removal properties. When the acid value of the carboxyl group is less than 10, the film-removing property due to alkali decreases, and when it exceeds 160, the water resistance deteriorates, and the inclusion of a slight amount of acid impairs the dispersibility of the solid lubricant and extender pigment in the treatment agent. It is easy to get caught. Particularly preferred are homopolymers of polyacrylic acid or polyacrylic acid ester, or copolymers of these resins with a copolymerizable resin, and those having an acid value of 10 or more and 160 or less. .

Further, the binder resin needs to have flexibility. This is for making the moldability of the lubricating coating obtained by the lubricant of the present invention good, and a resin having a glass transition temperature of 5 ° C to 100 ° C is preferable. If the glass transition temperature is lower than 5 ° C, the problem of poor blocking resistance occurs due to stickiness of the resin,
If the glass transition temperature exceeds 100 ° C., cracks will be generated in the lubricating film during the molding process, and insufficient lubrication and mold galling are likely to occur.

The invention of (2) is a lubrication-treated metal plate obtained by coating the surface of a metal plate with the film-removing lubrication agent of (1) and drying it.

A lubricating film obtained by applying a lubricating treatment agent and drying it has a film thickness of 0.5 μm or more and 10 μm or more.
In the following, it is necessary to be provided on one side or both sides of the metal plate. If the coating thickness is less than 0.5 μm, sufficient galling resistance cannot be obtained, while if it exceeds 10 μm, the degreasing and detergency becomes poor. Preferably 1 μm or more 5
μm or less.

No special technique is required for coating and drying,
It may be applied by a usual method, for example, a bar coater method, a roller coater method, a spray method, a dip method or the like, and dried by a commonly used method such as warm air drying or induction heating. The drying temperature is preferably 40 ° C. to 60 ° C. at the maximum reached plate temperature (PMT).

A metal plate (base material) to which a lubricant is applied
Is not particularly limited, and may be a carbon steel plate or a stainless steel plate having corrosion resistance. When the metal plate is a carbon steel plate, the lubricating film has sufficient corrosion resistance so there is no problem of corrosion before processing.When the metal plate is a stainless steel plate, the lubricating film is removed after forming to remove the metal surface. Suitable for use as an outer surface.

As described above, the use of the lubricating treatment agent of the present invention makes it possible to form a lubricating film which is excellent in anti-galling property, corrosion resistance and blocking resistance and has good film removal property. it can. Further, the lubricated metal plate having such a lubricating film can be easily manufactured according to the conventionally used method without using a special method.

[0031]

EXAMPLE A binder resin system composed of a monomer composition and a solid lubricant shown in Table 2 and an extender pigment shown in Table 1 were mixed, and Example No. 1 shown in Table 1 was also mixed. The lubrication treatment agents 1 to 24 were trial-produced.

Further, each of these lubrication treatment agents was applied to a metal plate (base material) by a bar coater method and baked at PMT of 100 ° C. in an oven to obtain a lubrication-treated metal plate sample. Base metal plate used (plate thickness: 0.8 mm)
Table 1 also shows the thickness of the lubricating film. The stainless steel plate is a JIS430J1L equivalent material, and the EG steel plate has a zinc basis weight of 20 g / m ² .

The following performance tests were carried out on these lubricating treatment agents and lubricating treatment metal plates.

[Lubricating agent] Dispersibility : After the binder resin system and the extender pigment were mixed, the particle size of the extender pigment was measured by a laser particle size distribution meter. Good if no aggregation of extender pigment was observed (marked with a circle),
Those in which agglomeration was observed were regarded as defective (x).

Stability : After the binder resin system and the extender pigment are mixed, no precipitation of the extender pigment is observed even after one day has passed. Good (◯);
And

[Lubricated Metal Plate] Mold galling resistance : A hat forming test with a beat was performed on each sample. The blank load at that time is 2
The pressure was set to 000 kgf, and the beat was polished with # 240 emery paper for each press, and the degree of scratches on the surface of the lubricated metal plate sample after molding / film removal was visually evaluated. The evaluation criteria were good (∘) when the presence of scratches was not found at a distance of 50 cm, and bad (x) when they were found.

Corrosion resistance : A salt spray test was conducted, and white rust was not observed after 120 hours had passed (good),
What was recognized was made into the defect (x).

Blocking resistance : Two samples of each sample were stacked and subjected to hot press treatment at 60 ° C. and 100 kgf / cm ² , and after 24 hours, no fusion of the samples was recognized (good), recognized. The obtained product was regarded as defective (x).

Film-removing property : After degreasing with an alkali (using sodium orthosilicate at 60 ° C.) spray for 10 seconds, those in which no lubricating film remains were evaluated as good (◯), and those in which lubricating film was recognized were evaluated as bad (×). ).

The performance test results are shown in Table 3. From this result, the lubricating film formed using the lubricating treatment agent of the present invention,
It can be seen that it has excellent anti-galling resistance, corrosion resistance, blocking resistance, and film removal type. Moreover, the dispersibility and stability of the treatment agent are excellent, and the coating agent has good coatability.
In addition, No. In Nos. 1, 2 and 7, the film performance was good, but the dispersibility or stability of the lubricating treatment agent was not good.

[0041]

[Table 1]

[0042]

[Table 2]

[0043]

[Table 3]

[0044]

EFFECTS OF THE INVENTION By using the lubricant of the present invention, it is possible to form a lubricating film having excellent anti-galling property, corrosion resistance and anti-blocking property as well as good film removal property on the surface of a metal plate. You can Further, the lubrication-treated metal plate of the present invention having such a lubrication film may be formed by applying the lubrication-treating agent by a usual method and drying it.
It can be easily manufactured.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location C10M 103: 06 107: 28) C10N 10:04 10:06 10:08 10:16 20:06 30 : 12 40:20 50:02 (72) Inventor Kenji Ikishima Sumitomo Metal Industries, Ltd. 4-53-3 Kitahama, Chuo-ku, Osaka-shi, Osaka

Claims (2)

[Claims] 1. A binder resin system comprising a water-soluble resin or water-dispersible resin which is flexible and soluble in an alkaline aqueous solution, and a solid lubricant, and an extender pigment having a particle size of 5 nm or more and 50 nm or less is non-volatile. 5% or more by weight% to the component 40
% Galling resistance, characterized by containing less than
A film-removing lubricant with excellent corrosion resistance and blocking resistance. 2. A film thickness of 0.5 μm formed by applying the lubricant according to claim 1 on at least one side of a metal plate and drying.
A lubricated metal sheet excellent in mold galling resistance, corrosion resistance, and blocking resistance, characterized by having a film having a thickness of 5 μm or less.