JP2016121389A - Rinse agent composition for steel plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide: a rinse agent composition for a steel plate that exhibits an excellent dewatering property even in rinsing treatment at low temperature and an excellent dewatering property even with a rinsing treatment for a short time, compared to conventional rinse agents; and a method of manufacturing a steel plate.SOLUTION: A rinse agent composition for a steel plate comprises: a component (a) that is at least one selected from compounds represented by the general formula (1); a component (b) that is at least one selected from compounds represented by the general formula (2); and a component (c) that is at least one selected from compounds represented by the general formula (3). Also provided is a method of manufacturing a steel plate using the same.SELECTED DRAWING: None

Description

  The present invention relates to a rinsing agent composition used in a rinsing process after cleaning and a method for manufacturing a steel plate in cleaning in steel strip manufacturing.

  When manufacturing a cold-rolled steel sheet and a cold-rolled coil, it goes through various processing steps. As the treatment step, there is an acid cleaning step for removing the oxide layer, or an alkali cleaning step for removing rolling oil or rust preventive oil. In these cleaning steps, an acidic or alkaline cleaning solution is rinsed with warm water and dried with hot air. Since rust is generated when the drying is insufficient, draining to remove water adhering to the steel sheet is an important process, and various draining methods are implemented. As the draining method, water is mechanically squeezed with a rubber roll called a ringer roll, or an air wiper is attached before hot air drying, and water attached to the steel sheet is skipped as much as possible. Further, the temperature of the rinsing water when rinsing the cleaning liquid is generally 70 ° C. or higher in order to improve the drying property. However, since a large amount of water is used for this rinsing, it takes a lot of energy costs to raise the temperature to a predetermined temperature. There is also a need to improve the productivity of steel sheets.

  Patent Document 1 discloses a specific cation as a rinsing agent composition that is inexpensive and has no adverse effects on the subsequent process even if it remains on the surface of the steel strip, has a small wastewater treatment load, and can reduce the cost of steam for raising the temperature of rinse water. A rinsing agent composition for steel sheet containing a functional compound and a specific nonionic compound is disclosed.

JP 2006-265726 A

  Patent Document 1 describes a steel sheet rinsing agent in which a specific amine compound and a specific nonionic surfactant are blended. However, in order to further reduce the steam cost for raising the temperature of the rinse water and further improve the productivity of the steel sheet, a rinsing process in a short time by increasing the line speed is desired.

  The subject of this invention is providing the rinse agent composition for steel plates which is excellent in the drainage property also in the rinse process in low temperature, and is excellent in the drainage property also in the short rinse process rather than the conventional rinse agent.

（式中、Ｒ^１は炭素数６以上２２以下の炭化水素基を示し、Ｒ^２は水素原子又は炭素数１以上２２以下の炭化水素基、Ｒ^３及びＲ^４は、同一又は異なって、水素原子又は炭素数１以上３以下の炭化水素基を示す。Ｘ^―は無機アニオンあるいは有機アニオンを示す。）で表される化合物から選ばれる少なくとも１種である成分（ａ）と、
下記一般式（２）：
Ｒ^５−Ｏ−（Ａ^１Ｏ）_ｍＨ （２）
（式中、Ｒ^５は炭素数８以上２０以下の直鎖又は分岐鎖のアルキル基又はアルケニル基、Ａ^１Ｏは炭素数２以上４以下のアルキレンオキシ基、ｍは平均付加モル数を示し、１以上１００以下の数である。ｍ個のＡ^１Ｏはそれぞれ同一でも異なっていても良い。）で表される化合物から選ばれる少なくとも１種である成分（ｂ）と、
下記一般式（３）：

（式中、Ｒ^６は炭素数１０以上２２以下の炭化水素基、Ａ^２Ｏは炭素数２以上４以下のアルキレンオキシ基、ｅ及びｆはそれぞれＡ^２Ｏの平均付加モル数を表す。ｅは１以上の数、ｆは０以上の数である。ｅ個及びｆ個のＡ^２Ｏはそれぞれ同一でも異なっていても良い。）で表される化合物から選ばれる少なくとも１種である成分（ｃ）とを含有する。 The rinse agent composition for steel sheets of the present invention has the following general formula (1):

(Wherein R ¹ represents a hydrocarbon group having 6 to 22 carbon atoms, R ² represents a hydrogen atom or a hydrocarbon group having 1 to 22 carbon atoms, R ³ and R ⁴ are the same or different, .X indicating the atom or having 1 or more carbon atoms of 3 or less hydrocarbon groups ^- from component (a) is at least one selected from compounds represented by represents an inorganic anion or an organic anion).
The following general formula (2):
R ⁵ —O— (A ¹ O) _m H (2)
(In the formula, R ⁵ is a linear or branched alkyl group or alkenyl group having 8 to 20 carbon atoms, A ¹ O is an alkyleneoxy group having 2 to 4 carbon atoms, m represents an average added mole number, A number of 1 to 100. m A ¹ Os may be the same or different from each other.) The component (b) is at least one selected from the compounds represented by:
The following general formula (3):

(In the formula, R ⁶ is a hydrocarbon group having 10 to 22 carbon atoms, A ² O is an alkyleneoxy group having 2 to 4 carbon atoms, and e and f each represent an average added mole number of A ² O. e Is a number of 1 or more, f is a number of 0 or more, and e and f A ² O may be the same or different.) c).

  ADVANTAGE OF THE INVENTION According to this invention, the rinse agent composition for steel plates which is excellent in the drainage property also in the rinse process in low temperature than the conventional rinse agent, and is excellent in the drainage property also in the short rinse process can be provided.

<Rinsing agent composition for steel plate>
The steel sheet rinse agent composition of the present embodiment (hereinafter referred to as the steel sheet rinse agent composition α, also simply referred to as the rinse agent composition α) is at least one selected from the compounds represented by the general formula (1). Component (a) which is a seed, Component (b) which is at least one selected from the compound represented by the general formula (2), and an alkylene oxide of an amine having a hydrocarbon group having 10 to 22 carbon atoms It contains at least one component (c) selected from adducts.

  The rinse agent composition α for a steel sheet of the present embodiment contains the component (a) and the component (b) described in Patent Document 1. And compared with patent document 1, in order to reduce a steam cost and to improve the rinse process effect in a short time, the rinse agent composition (alpha) for steel plates of this embodiment contains a component (c) further. The steel sheet rinse agent composition α of the present embodiment is superior in drainage property even in a rinsing process at a low temperature, and in a drainage property even in a short-term rinse treatment, as compared with a conventional rinse agent. The reason for this effect is not clear, but it is considered as follows.

  When the cationic compound of component (a) is adsorbed on the steel strip, the surface of the steel strip is hydrophobized and exhibits sufficient drainage. Component (b) is likely to form micelles at a lower concentration than component (a), and is considered to form micelles in which component (a) is incorporated into the micelle of component (b). On the other hand, the component (c) is a component used for the defoaming purpose in the cleaning agent, the component (c) has a smaller particle size of the micelle, the contact of the micelle with the steel strip surface is promoted, and the component (a) It is thought that the amount of adsorption to the steel strip surface increases. Further, the component (c) is also adsorbed to the steel sheet surface by amino groups and alkyleneoxy groups on the steel sheet, so that it is considered that the drainability is further improved by the hydrophobic group of the component (c). In general, when the line speed of steel plate production increases, the amount of adsorption of each component of the rinse agent composition tends to decrease, but sufficient draining by increasing the amount of adsorption of component (a) and adsorption of component (c) It is thought that gender is maintained.

[Component (a)]
Component (a) is at least one organic cationic compound selected from the compounds represented by the general formula (1), preferably an alkylamine acid salt and an alkylammonium salt, more preferably Alkylamine acid salt.

In the general formula (1), R ¹ has 6 or more carbon atoms, and is preferably 8 or more, more preferably 12 or more, still more preferably 16 or more, from the viewpoint of sufficiently hydrophobizing the steel sheet surface. It is 22 or less, preferably 18 or less, and from the viewpoint of sufficiently hydrophobizing the steel sheet surface, a linear or branched alkyl group or alkenyl group is preferable, and a linear alkyl group or alkenyl group is preferable. Examples of R ¹ include hexyl group, octyl group, 2-ethylhexyl group, decyl group, lauryl (dodecyl) group, tridecyl group, myristyl (tetradecyl) group, palmityl (hexadecyl) group, stearyl (octadecyl) group, and behenyl. Group, oleyl group, etc. From the viewpoint of sufficiently hydrophobizing the steel sheet surface, hexyl group, octyl group, lauryl (dodecyl) group, tridecyl group, myristyl (tetradecyl) group, palmityl (hexadecyl) group, stearyl (octadecyl) ) Group, behenyl group and oleyl group are preferred, palmityl (hexadecyl) group, stearyl (octadecyl) group, behenyl group and oleyl group are more preferred, and oleyl group is still more preferred.

In the general formula (1), R ² is preferably a hydrogen atom or 1 or more carbon atoms, and from the viewpoint of sufficiently hydrophobizing the steel sheet surface, preferably 6 or more, more preferably 8 or more, still more preferably 12 or more, and even more. Preferably, it is 16 or more, and is 22 or less, preferably 18 or less. From the viewpoint of sufficiently hydrophobizing the steel sheet surface, a linear or branched alkyl group or alkenyl group is preferable, and a linear alkyl group or An alkenyl group is more preferred. Examples of R ² include hydrogen atom, methyl group, ethyl group, isopropyl group, hexyl group, octyl group, 2-ethylhexyl group, decyl group, lauryl (dodecyl) group, tridecyl group, myristyl (tetradecyl) group, palmityl. (Hexadecyl) group, stearyl (octadecyl) group, behenyl group, oleyl group and the like can be mentioned. R ² is preferably a hydrogen atom from the viewpoint of sufficiently hydrophobizing the steel sheet surface.

R ³ and R ⁴ are the same or different and represent a hydrogen atom or a hydrocarbon group having 1 to 3 carbon atoms such as a methyl group, an ethyl group, and an isopropyl group, and from the viewpoint of sufficiently hydrophobizing the steel sheet surface, Atoms are preferred.

Specific examples of X ⁻ include halide ions such as chloride ions and bromide ions, organic anions obtained by removing protons from organic acids such as acetic acid, lactic acid and citric acid, and alkyl sulfate ions having 1 to 5 carbon atoms ( CH ₃ SO ₄ ⁻ , C ₂ H ₅ SO ₄ ⁻ , C ₃ H ₇ SO ₄ ⁻ etc.), alkyl carbonate ions (CH ₃ CO ₃ ⁻ ), alkyl phosphate ions, etc. From the viewpoint of hydrophobization, halide ions such as chloride ions and bromide ions and organic anions such as CH ₃ CO ₃ ^— are preferable, and organic anions are more preferable.

As the component (a), dioctylamine, didecylamine, dilaurylamine, dimyristylamine, decyloctylamine, lauryloctylamine, laurylamine, lauryldimethylamine, myristylamine, myristyldimethylamine, palmitylamine, palmityldimethylamine , Stearylamine, stearyldimethylamine, oleylamine, acid neutralized product or quaternized product (quaternary ammonium salt) of oleyldimethylamine. In the case of an acid neutralized product, at least one of R ² , R ³ and R ⁴ is a hydrogen atom.

  Preferred acids for obtaining an acid neutralized product include hydrochloric acid, sulfuric acid, nitric acid, phosphoric acid, acetic acid, formic acid, maleic acid, fumaric acid, citric acid, tartaric acid, adipic acid, sulfamic acid, toluenesulfonic acid, lactic acid, pyrrolidone -2-carboxylic acid, succinic acid and the like are mentioned, and from the viewpoint of sufficiently hydrophobizing the steel sheet surface, hydrochloric acid and acetic acid are preferable, and acetic acid is more preferable. Preferred quaternizing agents for obtaining quaternary ammonium salts include alkyl halides such as methyl chloride, ethyl chloride, methyl bromide and methyl iodide, dimethyl sulfate, diethyl sulfate, di-n-propyl sulfate and the like. The general alkylating agent of these is mentioned.

  The component (a) is an acid neutralized product of monoalkylamine having 6 to 22 carbon atoms, an acid neutralized product of monoalkylmethylamine having 6 to 22 carbon atoms, and having 6 to 22 carbon atoms. Acid neutralized product of monoalkyldimethylamine, acid neutralized product of dialkylmethylamine having 1 to 22 carbon atoms, acid neutralized product of dialkyldimethylamine having 1 to 22 carbon atoms, carbon number of 6 to 22 Examples thereof include the following alkyltrimethylammonium and dialkylammonium having 1 to 22 carbon atoms. Specifically, laurylamine hydrochloride, stearylamine hydrochloride, oleylamine hydrochloride, hexylamine acetate, behenylamine acetate, laurylamine acetate, myristylamine acetate, palmitylamine Acetate, stearylamine acetate, oleylamine acetate, dioctylamine hydrochloride, lauryltrimethylammonium bromide, stearyltrimethylammonium chloride, oleyltrimethylammonium chloride, lauryltrimethylammonium chloride, myristyltrimethylammonium chloride, palmityltrimethylammonium chloride , Stearyl trimethyl ammonium chloride, behenyl trimethyl ammonium chloride, dioctyl dimethyl ammonium chloride , Dilauryldimethylammonium chloride, dimyristyldimethylammonium chloride, distearyldimethylammonium chloride, dioleyldimethylammonium chloride, etc. Acetate, laurylamine acetate, hexadecylamine acetate, oleylamine acetate, stearylamine acetate, behenylamine acetate, hexylamine hydrochloride, octylamine hydrochloride, laurylamine hydrochloride Hexadecylamine hydrochloride, oleylamine hydrochloride, stearylamine hydrochloride and behenylamine hydrochloride are preferred, hexadecylamine hydrochloride, oleylamine hydrochloride and oleylamine acetate are more preferred. Arbitrariness.

  The concentration of the component (a) is preferably 5 mg / kg or more, more preferably 10 mg / kg or more, still more preferably 12 mg / kg or more, from the viewpoint of sufficiently hydrophobizing the steel sheet surface, and an excessive component (a). Is not more than 1000 mg / kg, more preferably not more than 800 mg / kg, still more preferably not more than 500 mg / kg, and more preferably 300 mg / kg. The following is more preferable, 150 mg / kg or less is more preferable, 100 mg / kg or less is still more preferable, and 70 mg / kg or less is still more preferable.

[Component (b)]
The component (b) is at least one compound selected from the compounds represented by the general formula (2).

In the general formula (2), A ¹ O means an alkyleneoxy group having 2 to 4 carbon atoms such as an ethyleneoxy group, a propyleneoxy group, or a butyleneoxy group. Of these, an ethyleneoxy group and a propyleneoxy group are preferable. There may be a plurality of types of A ¹ O. In that case, block bonds, random bonds, alternating bonds, etc. can be used, block bonds and / or random bonds are preferred, and random bonds are more preferred.

In the general formula (2), R ⁵ is a linear or branched alkyl or alkenyl group having 8 or more, preferably 10 or more, more preferably 12 or more, and 20 or less, preferably 18 or less. . Examples of the alkyl group include octyl group, 2-ethylhexyl group, decyl group, sec-decyl group, lauryl (dodecyl) group, sec-lauryl group, myristyl group, cetyl group, palmityl group, stearyl group, and the like. A decyl group, a lauryl group, a myristyl group, a palmityl group, and a stearyl group are preferable, and a myristyl group, a palmityl group, and a stearyl group are more preferable. In the general formula (2), m represents an average added mole number, 1 or more, preferably 3 or more, more preferably 10 or more, and 100 or less, preferably 50 or less, more preferably 40 or less, and still more preferably. Is 35 or less.

  Specifically, the component (b) includes one or more selected from the following.

C _j H _{2j + 1} −O (EO) _pH
C _j H _{2j + 1} −O (EO) _q (PO) _r H (however, EO and PO added as a block)
C _j H _{2j + 1} −O (PO) _r (EO) _q H (however, EO and PO are added as a block)
C _j H _{2j + 1} −O (EO) _s (PO) _t (EO) _u H (however, EO and PO are added as a block)
C _j H _{2j + 1} −O (EO) _q (PO) _r H (however, EO and PO are randomly added)

In the formula of the preceding paragraph, EO is an ethyleneoxy group (C ₂ H ₄ O), PO is a propyleneoxy group (C ₃ H ₆ O), j is an integer of 8 or more and 20 or less, p, q, r, s, t , U is the average number of moles added, p is a number from 3 to 40, q is a number from 1 to 40, r is a number from 1 to 40, s is a number from 1 to 30 and t is A number from 1 to 30; u is a number from 1 to 30; q + r is a number from 3 to 100; and s + t + u is a number from 3 to 100.

More preferably, 1 or more things chosen from the following are mentioned.
_{C 18 H 35 O (EO)} 4 H, C 12 H 25 O (EO) 5 (PO) 2 (EO) 5 H, C 14 H 29 O (EO) 7 (PO) 2 (EO) 7 H, C ₁₆ H ₃₃ O (EO) ₇ (PO) ₂ (EO) ₇ H, C ₁₆ H ₃₃ O (EO) ₁₀ (PO) ₁₂ H, C ₁₈ H ₃₇ O (EO) ₁₀ (PO) ₉ H, C ₁₈ H ₃₇ O (EO) ₈ (PO) ₆ H (however, EO and PO are randomly added), C ₁₈ H ₃₇ O (EO) ₁₂ (PO) ₂₁ H (however, EO and PO are randomly added) ), C ₁₈ H ₃₇ O (EO) ₁₅ (PO) ₁₅ H (however, EO and PO are added as a block), C ₁₈ H ₃₇ O (EO) ₈ (PO) ₂₁ H (where EO and PO are Random addition).

  Note that (EO) and (PO) indicate that blocks are added in this order unless otherwise specified.

  The concentration of the component (b) in the rinse agent composition α is preferably 1 mg / kg or more, more preferably 3 mg / kg or more from the viewpoint of promoting the adsorption of the component (a) and promoting the hydrophobization of the steel sheet. And from the viewpoint of not hindering the subsequent annealing process and plating process, 500 mg / kg or less is preferable, 300 mg / kg or less is more preferable, 200 mg / kg or less is more preferable, and 100 mg / kg or less is more preferable. 80 mg / kg or less is more preferable, and 50 mg / kg or less is still more preferable.

  The mass ratio of the component (a) to the component (b) is preferably 0.1 or more in terms of (a) / (b) from the viewpoint of expressing water repellency and suppressing the adhesion of water on the steel sheet surface. The above is more preferable, 1.0 or more is further preferable, 2.0 or more is further preferable, 15 or less is preferable, 10 or less is more preferable, and 7.0 or less is further preferable.

[Component (c)]
Component (c) is at least one compound selected from the compounds represented by formula (3).

In the general formula (3), R ⁶ is a hydrocarbon group having 10 to 22 carbon atoms. The number of carbon atoms in R ⁶ is preferably 12 or more, more preferably 16 or more, and preferably 20 or less, more preferably 18 or less, from the viewpoint of sufficiently hydrophobizing the steel sheet surface. The hydrocarbon group of R ⁶ is preferably a linear or branched alkyl group or alkenyl group, more preferably a linear alkyl group or alkenyl group, from the viewpoint of sufficiently hydrophobizing the steel sheet surface. Examples of the hydrocarbon group include a decyl group, a lauryl group, a myristyl group, a palmityl group, a stearyl group, an isostearyl group, a behenyl group, and an oleyl group. From the viewpoint of sufficiently hydrophobizing the steel sheet surface, a lauryl group, a myristyl group, etc. Group, palmityl group, stearyl group and oleyl group are preferable, and stearyl group and oleyl group are more preferable.

  As component (c), polyoxyethylene decylamine, polyoxyethylene laurylamine, polyoxyethylene myristylamine, polyoxyethylene palmitylamine, polyoxyethylene stearylamine, polyoxyethylene isostearylamine, polyoxyethylene behenylamine , Polyoxyethylene oleylamine, polyoxyethyleneoxypropylene laurylamine, polyoxyethyleneoxypropylene myristylamine, polyoxyethyleneoxypropylene palmitylamine, polyoxyethyleneoxypropylene stearylamine, polyoxyethyleneoxypropylene isostearylamine, polyoxy Ethyleneoxypropylene behenylamine, polyoxyethyleneoxypropylene oleylamine, poly Examples include oxyethyleneoxybutylene stearylamine, polyoxyethyleneoxybutylene isostearylamine, polyoxyethyleneoxybutylene behenylamine, polyoxyethyleneoxybutylene oleylamine, etc. From the viewpoint of sufficiently hydrophobizing the steel sheet surface, polyoxyethylene lauryl Amine, polyoxyethylene myristylamine, polyoxyethylene palmitylamine, polyoxyethylene stearylamine, polyoxyethylene isostearylamine, and polyoxyethylene oleylamine are preferable, and polyoxyethylene stearylamine and polyoxyethylene oleylamine are more preferable.

In the general formula (3), A ² O means an alkyleneoxy group having 2 to 4 carbon atoms such as an ethyleneoxy group, a propyleneoxy group, or a butyleneoxy group. Among these, an ethyleneoxy group and a propyleneoxy group are preferable, and an ethyleneoxy group is more preferable. There may be a plurality of types of A ² O. In that case, block bonds, random bonds, alternating bonds, etc. can be used, block bonds and / or random bonds are preferred, and random bonds are more preferred.

In Formula (3), respectively, e and f represents an average addition number of moles of A ^{2 O.} e is a number of 1 or more, and f is a number of 0 or more. Each of e and f A ² O may be the same or different. The total (e + f) of the average added mole number (average polymerization degree) of the alkyleneoxy group is 1 or more, preferably 2 or more, more preferably 4 or more, and preferably 20 or less, more preferably 10 or less. More preferably, it is 6 or less. Specifically, an ethyleneoxy group having an average added mole number (e + f) of 1 to 20 and an ethyleneoxy group and a propyleneoxy group having an average added mole number (e + f) of 1 to 20 and an average added mole. Examples include ethyleneoxy groups and butyleneoxy groups having a total number (e + f) of 1 to 20, preferably ethylene ethylene groups having an average added mole number (e + f) of 1 to 10 inclusive.

  The concentration of the component (c) in the rinse agent composition α is preferably 1 mg / kg or more, more preferably 3 mg / kg or more from the viewpoint of promoting the hydrophobization of the steel sheet, and the subsequent annealing process or plating process. From the viewpoint of avoiding an obstacle, 500 mg / kg or less is preferable, 300 mg / kg or less is more preferable, 200 mg / kg or less is more preferable, 100 mg / kg or less is still more preferable, 50 mg / kg or less is even more preferable, 30 mg / kg or less is still more preferable.

  The mass ratio of the component (b) and the component (c) is preferably 0.20 or more, more preferably 0.40 in terms of the component (b) / component (c) from the viewpoint of sufficiently hydrophobizing the steel sheet surface. More preferably, it is 0.80 or more, and preferably 9.0 or less, more preferably 4.5 or less, still more preferably 2.0 or less, and still more preferably 1.2 or less.

  The component (a), the mass ratio of the component (b) and the component (c) is [component (a) / [component (b) + component (c)] from the viewpoint of sufficiently hydrophobizing the steel sheet surface. ], Preferably 0.80 or more, more preferably 1.5 or more, still more preferably 1.6 or more, preferably 9.0 or less, more preferably 4.0 or less, still more preferably 3.2 or less. More preferably, it is 2.5 or less.

  The rinse agent composition α is an aqueous composition containing the component (a), the component (b), and the component (c), and water is used as the aqueous medium. As water, deionized water, ion-exchanged water, tap water, industrial water and the like can be preferably used.

  The rinse agent composition α may further contain an antifoaming agent, a chelating agent, a preservative, and the like as long as the effect of the present embodiment is obtained. The rinse agent composition α has a pH of preferably 3 or more, more preferably 5 or more, still more preferably 6 or more, and preferably 10 or less, preferably 9 or less, from the viewpoint of water repellency on the surface of the steel strip. More preferred.

<Manufacturing method of steel plate>
The said rinse agent composition (alpha) can be used for manufacture of a steel plate. The manufacturing method of the steel plate using the rinse agent composition α includes a cleaning step (1) for cleaning the steel plate after cold rolling, and a rinsing step (2) for the steel plate after the cleaning step (1) has been performed. A method of manufacturing a steel sheet including a drying step (3) for drying the steel plate after the rinsing step (2) is performed, wherein the rinsing step (2) includes one or more rinsing processes, and the last rinsing The rinse agent composition α is used for the treatment.

[Washing step (1) for washing the steel sheet after cold rolling]
In the cleaning step (1), dirt such as rolling oil adhering to the steel sheet is cleaned with a cleaning agent in accordance with conventional conditions. The steel plate may be any metal, but it is preferable to target iron from the viewpoint of promoting drying and preventing rust. As the cleaning agent, for example, alkaline cleaning agents as described in JP-A-10-280179 and JP-A-10-324900 can be used.

  As the alkaline detergent, an aqueous solution containing an alkaline agent is used. Any alkaline agent can be used as long as it is a water-soluble alkaline agent in order to ensure the removal of oil stains. Specific examples of alkali agents include hydroxides of alkali metals such as sodium hydroxide and potassium hydroxide, silicates such as sodium orthosilicate, sodium metasilicate and sodium sesquisilicate, phosphates such as trisodium phosphate, Examples thereof include carbonates such as disodium carbonate, sodium hydrogencarbonate and dipotassium carbonate, and borate salts such as sodium borate. Two or more water-soluble alkaline agents may be combined. The content of the alkaline agent is preferably 0.1% by mass or more, more preferably 1% by mass or more, and preferably 10% by mass or less, more preferably 5% by mass or less in the alkaline detergent.

  In addition to alkaline agents, alkaline detergents include nonionic surfactants such as polyoxyalkylene alkyl ethers; chelate iron ions etc. by acting on dirt such as iron soap, and easily dissolve the dirt as fatty acid soap Thus, an aliphatic carboxylic acid or a salt thereof can be added from the viewpoint of ensuring stability during storage and stability of effects after storage. In addition, any additive can be added to the alkaline detergent, for example, a commonly used additive such as an organic builder that improves the washability is formulated in consideration of an increase in cost. can do. Although the ratio of components other than the alkali agent in the alkali detergent is appropriately determined, it is preferably 1 part by mass or less, more preferably 0.5 part by mass or less with respect to 1 part by mass of the alkali agent. Moreover, as for the alkali detergent, the ratio of the non volatile matter containing components other than an alkali agent and an alkali agent has preferable 1 mass% or more and 10 mass% or less.

  Examples of the cleaning step (1) include immersion cleaning, spray cleaning, brush cleaning, and electrolytic cleaning. Electrolytic cleaning is a cleaning method in which the steel sheet is made positive (or negative) in the cleaning liquid and a direct current is passed through it. Oxygen (or hydrogen) bubbles generated from the steel sheet by the current are used, and oil stains attached to the steel sheet by physical force. It is a process of removing solid dirt such as iron powder. Moreover, the acid cleaning which removes the oxide film produced | generated on the steel plate surface with an acid cleaning agent may be used.

[Rinsing step after washing step (1) (2)]
In the rinsing step (2), the steel plate after the washing step (1) is rinsed with water or a rinsing agent to remove the cleaning agent and remaining rolling oil. From the viewpoint of improving the drying property of the steel sheet, the rinse agent composition α is used for the final rinsing process in the rinsing step (2).

  In the rinsing step (2), the rinsing agent composition α is preferably 50 ° C. or lower, more preferably 40 ° C. or lower, and further preferably 35 ° C. in order to reduce the energy cost required to raise the temperature of the rinsing agent. Hereinafter, it is more preferably used at 30 ° C. or lower. There is no particular lower limit, but it is usually 5 ° C or higher.

  In the rinsing step (2), one or more rinsing treatments can be included, but the rinse agent composition α is brought into contact with the steel sheet in the final rinsing treatment before reaching the drying step, and the cleaning step (1) is performed. The applied steel sheet is processed. When two or more rinsing processes are included, the rinsing process (2) can be rinsed with a rinsing agent or water other than the rinsing agent composition α, but in the final rinsing process of the rinsing process (2), It is preferable to use the rinse agent composition α.

  As a specific example of the rinsing agent treatment using the rinsing agent composition α performed in the final rinsing process of the rinsing step (2), the steel sheet is rinsed with a brush to rinse the steel sheet, and the spray is not brushed. The above-mentioned spray rinsing treatment for rinsing the steel sheet, and the rinsing rinsing treatment for rinsing the steel sheet. Among these, the immersion rinse treatment and / or the spray rinse treatment are preferable from the viewpoint of efficiently acting the rinse agent composition α on the steel sheet, and the rinse agent composition α can be directly and efficiently acted on the steel sheet. And spray rinse treatment is more preferable. Moreover, the rinse agent composition (alpha) sprayed with the rinse agent composition (alpha), the rinse agent composition (alpha) distilled from the steel plate surface after spray treatment can be introduce | transduced into an immersion tank, and can be reused.

  In the brush rinsing treatment, the rinse agent composition α is brought into contact with the steel sheet by spraying the rinse agent composition α on the steel sheet and the brush roll while conveying the steel sheet between the brush rolls or between the brush roll and the transport roll. . The rotation speed of the brush roll is preferably 100 revolutions / minute or more, more preferably 500 revolutions / minute or more, and preferably 1200 revolutions / minute or less, more preferably 1000 revolutions / minute or less.

In the spray rinsing treatment, the rinse agent composition α is directly sprayed on the steel sheet, and the rinse agent composition α is brought into contact with the steel sheet. The spraying conditions are preferably a spray pressure of 0.01 MPa or more, more preferably 0.05 MPa or more, further preferably 0.1 MPa or more, more preferably 3 MPa or less, more preferably 2 MPa or less, and further preferably 1.5 MPa or less. Preferably, 1 MPa or less is still more preferable. Spray volume is preferably 0.01 m ³ / time or more, more preferably at least 0.05 m ³ / time, 0.1 m ³ / time or more, and then, preferably 100 m ³ / time or less, 50 m ³ / time or less Is more preferably 10 m ³ / hour or less. The spray time (contact time in the spray rinse treatment) is preferably 0.01 seconds or more, more preferably 0.1 seconds or more, still more preferably 1 second or more, and preferably 30 seconds or less, more preferably 10 seconds or less.

  In the immersion rinse treatment, the immersion time in the rinse agent composition α is preferably 1 second or more and 5 seconds or less, and when showering, the spray pressure is 0.05 MPa or more and 1.5 MPa or less, and 0.1 seconds or more and 5 seconds. The following is preferred.

  In the case where two or more rinse treatments are included in the rinsing step (2), when the steel sheet is treated with a rinse agent other than water or the rinse agent composition α, the brush rinse is performed with a rinse agent other than water or the rinse agent composition α. A method of treating and rinsing with a rinse agent composition α and a method of immersing and rinsing with a rinse agent other than water or the rinse agent composition α and spray rinsing with the rinse agent composition α are preferred. From the viewpoint of reducing the drying load of the steel sheet, it is more preferable to treat with a rinse agent composition α after treating with water. Specifically, a method of performing a brush rinse treatment with water and an immersion rinse treatment with the rinse agent composition α and a method of performing an immersion rinse treatment with water and a spray rinse treatment with the rinse agent composition α are more preferable.

  Further, for example, when treating with a rinse agent other than water or the rinse agent composition α, the temperature of the water used is preferably 5 ° C. or higher, more preferably 10 ° C. or higher, and preferably, in order to reduce energy costs. Is 40 ° C. or lower, more preferably 35 ° C. or lower, and still more preferably 30 ° C. or lower. As a method of treating with water, the steel plate may be immersed in water or a rinse agent, and may be rinsed with a shower or the like.

  In the brush rinsing process, water or a rinse agent is brought into contact with the steel sheet by spraying the steel sheet and the brush roll while transporting the steel sheet between the brush rolls or between the brush roll and the transport roll. The rotation speed of the brush roll is preferably 100 revolutions / minute or more, more preferably 500 revolutions / minute or more, and preferably 1200 revolutions / minute or less, more preferably 1000 revolutions / minute or less.

In the spray rinsing process, water or a rinse agent is directly sprayed on the steel sheet, and the steel sheet is brought into contact with water or a rinse agent. The spraying conditions are preferably a spray pressure of 0.01 MPa or more, more preferably 0.05 MPa or more, further preferably 0.1 MPa or more, more preferably 3 MPa or less, more preferably 2 MPa or less, and further preferably 1.5 MPa or less. Preferably, 1 MPa or less is still more preferable. Spray volume is preferably 0.01 m ³ / time or more, more preferably at least 0.05 m ³ / time, 0.1 m ³ / time or more, and then, preferably 100 m ³ / time or less, 50 m ³ / time or less Is more preferably 10 m ³ / hour or less. The spray time (contact time in the spray rinse treatment) is preferably 0.01 seconds or more, more preferably 0.1 seconds or more, still more preferably 1 second or more, and preferably 30 seconds or less, more preferably 10 seconds or less.

  In the rinsing step (2), when the steel sheet is immersed in water or a rinse agent, the immersion time of the steel sheet in water or rinse agent is preferably 0.5 seconds or more, more preferably 1 second or more, and 10 Seconds or less are preferable, and 5 seconds or less are more preferable.

  The said washing | cleaning process (1) and the rinse process (2) are normally provided as a continuous line which conveys a steel plate. The conveying speed of the steel plate is usually 30 m / min or more, and from the viewpoint of productivity of the steel plate, preferably 50 m / min or more, more preferably 100 m / min or more, still more preferably 300 m / min or more, and 1000 m / Min or less, preferably 800 m / min or less, and considering the transfer line speed, each processing time in the washing step (1) and the rinsing step (2) is set.

  Furthermore, from the viewpoint of reducing the load in the drying step (3), the rinse agent treatment using the rinse agent composition α was performed between the rinse agent treatment using the rinse agent composition α and the drying step (3). It is preferable to perform a process of holding the surface of the steel plate substantially perpendicular to the ground. By this treatment, the amount of water remaining on the surface of the steel plate is reduced because the water on the surface of the steel plate that has been rendered water repellent with the rinse agent composition α falls due to gravity. From the viewpoint of reducing the amount of water on the surface of the steel sheet, the time for maintaining the substantially vertical is preferably 1 second or more, more preferably 3 seconds or more, and preferably 30 seconds or less from the viewpoint of conveying the steel sheet. More preferred is seconds or less.

[Drying step (3) for drying the steel sheet after the rinsing step (2) is performed]
In the drying step (3), the rinsing step (2) is performed, and the steel sheet to which the rinse agent composition α is attached is dried. In the drying step (3), the steel sheet to which the rinsing agent composition α is adhered is dried in accordance with conventional conditions. From the viewpoint of reducing energy in the drying means at high temperature such as an oven, after the rinse agent treatment using the rinse agent composition α, a gas such as air is sprayed on the surface of the steel plate at the beginning of the drying step (3). In addition, it is preferable to perform a process of blowing off moisture on the steel plate. As a drying means in the drying step, for example, a method of putting in an oven at 80 ° C. or higher and 150 ° C. or lower, preferably 120 ° C. or lower is given. Moreover, the method of injecting gas, such as air adjusted to these temperatures, to the steel plate surface is mentioned. For example, the drying time is preferably 60 seconds or less, more preferably 40 seconds or less, and even more preferably 20 seconds or less from the viewpoint of reducing the number of heaters in a continuous line that conveys the steel sheet and reducing the energy cost. In a production facility of a steel sheet factory, a method of heating at 80 ° C. or higher and 150 ° C. or lower, preferably 120 ° C. or lower, for 3 to 10 seconds and drying is exemplified.

  The steel plate obtained after washing can be used in various applications such as automotive steel plates, steel plates for beverages such as canned foods, and steel plates for home appliances.

（式中、Ｒ^１は炭素数６以上２２以下の炭化水素基を示し、Ｒ^２は水素原子又は炭素数１以上２２以下の炭化水素基、Ｒ^３及びＲ^４は、同一又は異なって、水素原子又は炭素数１以上３以下の炭化水素基を示す。Ｘ^―は無機アニオンあるいは有機アニオンを示す。）で表される化合物から選ばれる少なくとも１種である成分（ａ）と、下記一般式（２）：
Ｒ^５−Ｏ−（Ａ^１Ｏ）_ｍＨ （２）
（式中、Ｒ^５は炭素数８以上２０以下の直鎖又は分岐鎖のアルキル基又はアルケニル基、Ａ^１Ｏは炭素数２以上４以下のアルキレンオキシ基、ｍは平均付加モル数を示し、１以上１００以下の数である。ｍ個のＡ^１Ｏはそれぞれ同一でも異なっていても良い。）で表される化合物から選ばれる少なくとも１種である成分（ｂ）と、
下記一般式（３）：

（式中、Ｒ^６は炭素数１０以上２２以下の炭化水素基、Ａ^２Ｏは炭素数２以上４以下のアルキレンオキシ基、ｅ及びｆはそれぞれＡ^２Ｏの平均付加モル数を表す。ｅは１以上の数、ｆは０以上の数である。ｅ個及びｆ個のＡ^２Ｏはそれぞれ同一でも異なっていても良い。）で表される化合物から選ばれる少なくとも１種である成分（ｃ）とを含有する、鋼板用リンス剤組成物。 This specification discloses the following compositions and manufacturing methods further regarding embodiment mentioned above.
<1> The following general formula (1):

(Wherein R ¹ represents a hydrocarbon group having 6 to 22 carbon atoms, R ² represents a hydrogen atom or a hydrocarbon group having 1 to 22 carbon atoms, R ³ and R ⁴ are the same or different, .X indicating the atom or having 1 or more carbon atoms of 3 or less hydrocarbon groups ^-. the component (a) is at least one selected from compounds represented by) indicating an inorganic anion or an organic anion, the following general formula ( 2):
R ⁵ —O— (A ¹ O) _m H (2)
(In the formula, R ⁵ is a linear or branched alkyl group or alkenyl group having 8 to 20 carbon atoms, A ¹ O is an alkyleneoxy group having 2 to 4 carbon atoms, m represents an average added mole number, A number of 1 to 100. m A ¹ Os may be the same or different from each other.) The component (b) is at least one selected from the compounds represented by:
The following general formula (3):

(In the formula, R ⁶ is a hydrocarbon group having 10 to 22 carbon atoms, A ² O is an alkyleneoxy group having 2 to 4 carbon atoms, and e and f each represent an average added mole number of A ² O. e Is a number of 1 or more, f is a number of 0 or more, and e and f A ² O may be the same or different.) The rinse agent composition for steel plates containing c).

<2> R ¹ has 6 or more carbon atoms, preferably 8 or more, more preferably 12 or more, still more preferably 16 or more, and 22 or less, preferably 18 or less, The rinse agent composition for steel sheet according to <1>, which is a branched alkyl group or alkenyl group.
<3> R ¹ is hexyl, octyl, 2-ethylhexyl, decyl, lauryl (dodecyl), tridecyl, myristyl (tetradecyl), palmityl (hexadecyl), stearyl (octadecyl), behenyl Group, oleyl group is preferable, hexyl group, octyl group, lauryl (dodecyl) group, tridecyl group, myristyl (tetradecyl) group, palmityl (hexadecyl) group, stearyl (octadecyl) group, behenyl group, oleyl group are more preferable, palmityl (Hexadecyl) group, stearyl (octadecyl) group, behenyl group, oleyl group are more preferable, and oleyl group is still more preferable, The rinse agent composition for steel plates as described in said <1> or <2>.
<4> The R ² is a hydrogen atom or 1 or more carbon atoms, preferably 6 or more, more preferably 8 or more, still more preferably 12 or more, still more preferably 16 or more, and 22 or less, preferably 18 The rinsing agent for steel sheet according to any one of <1> to <3>, which is preferably a linear or branched alkyl group or alkenyl group, more preferably a linear alkyl group or alkenyl group. Composition.
<5> R ² is a hydrogen atom, methyl group, ethyl group, isopropyl group, hexyl group, octyl group, 2-ethylhexyl group, decyl group, lauryl (dodecyl) group, tridecyl group, myristyl (tetradecyl) group, palmityl (Hexadecyl) group, stearyl (octadecyl) group, behenyl group, oleyl group are preferable, and a hydrogen atom is more preferable, The rinse agent composition for steel plates in any one of said <1>-<4>.
<6> R ³ and R ⁴ are the same or different and are preferably a hydrogen atom or a hydrocarbon group having 1 to 3 carbon atoms such as a methyl group, an ethyl group, and an isopropyl group, and more preferably a hydrogen atom. The rinse agent composition for steel plates in any one of 1>-<5>.
<7> X ⁻ represents a halide ion such as a chloride ion or a bromide ion, an organic anion obtained by removing a proton from an organic acid such as acetic acid, lactic acid or citric acid, an alkyl sulfate ion having 1 to 5 carbon atoms (CH ₃ SO ₄ ⁻ , C ₂ H ₅ SO ₄ ⁻ , C ₃ H ₇ SO ₄ ^— etc.), alkyl carbonate ions (CH ₃ CO ₃ ⁻ ), alkyl phosphate ions are preferred, and halides such as chloride ions and bromide ions ions and CH ₃ CO ₃ ^- organic anions are more preferred, such as, organic anions are more preferred, the <1> to steel rinse composition according to any one of <6>.
<8> The component (a) is an acid neutralized monoalkylamine having 6 to 22 carbon atoms, an acid neutralized monoalkylmethylamine having 6 to 22 carbon atoms, and 6 or more carbon atoms. An acid neutralized product of monoalkyl dimethylamine having 22 or less, an acid neutralized product of dialkylmethylamine having 1 to 22 carbon atoms, an acid neutralized product of dialkyldimethylamine having 1 to 22 carbon atoms, The rinsing agent composition for steel sheet according to any one of <1> to <7>, wherein 6 to 22 alkyltrimethylammonium and dialkylammonium having 1 to 22 carbon atoms are preferable.
<9> The component (a) is laurylamine hydrochloride, stearylamine hydrochloride, oleylamine hydrochloride, hexylamine acetate, behenylamine acetate, laurylamine acetate, myristylamine acetate , Palmitylamine acetate, stearylamine acetate, oleylamine acetate, dioctylamine hydrochloride, lauryltrimethylammonium bromide, stearyltrimethylammonium chloride, oleyltrimethylammonium chloride, lauryltrimethylammonium chloride, myristyltrimethylammonium chloride, Palmityl trimethyl ammonium chloride, stearyl trimethyl ammonium chloride, behenyl trimethyl ammonium chloride, dioctyl dimethyl ammonium Preference is given to um chloride, dilauryl dimethyl ammonium chloride, dimyristyl dimethyl ammonium chloride, distearyl dimethyl ammonium chloride, dioleyl dimethyl ammonium chloride, hexylamine acetate, octylamine acetate, laurylamine acetate, hexadecylamine Acetate, oleylamine acetate, stearylamine acetate, behenylamine acetate, hexylamine hydrochloride, octylamine hydrochloride, laurylamine hydrochloride, hexadecylamine hydrochloride, oleylamine hydrochloride Stearylamine hydrochloride and behenylamine hydrochloride are more preferable, hexadecylamine hydrochloride, oleylamine hydrochloride and oleylamine acetate are more preferable, <1> to < Steel rinse composition according to any one of>.
The concentration of the <10> component (a) in the rinsing agent composition for steel sheet is preferably 5 mg / kg or more, more preferably 10 mg / kg or more, still more preferably 12 mg / kg or more, and preferably 1000 mg / kg or less. 800 mg / kg or less, more preferably 500 mg / kg or less, still more preferably 300 mg / kg or less, even more preferably 150 mg / kg or less, still more preferably 100 mg / kg or less, and more preferably 70 mg / kg or less. More preferably, the rinse agent composition for steel sheet according to any one of <1> to <9>.
<11> R ⁵ is a linear or branched alkyl or alkenyl group having 8 or more carbon atoms, preferably 10 or more, more preferably 12 or more, and 20 or less, preferably 18 or less. The rinse agent composition for steel plates according to any one of <1> to <10>.
<12> The alkyl group is preferably an octyl group, 2-ethylhexyl group, decyl group, sec-decyl group, lauryl (dodecyl) group, sec-lauryl group, myristyl group, cetyl group, palmityl group or stearyl group. , Decyl group, lauryl group, myristyl group, palmityl group and stearyl group are more preferable, myristyl group, palmityl group and stearyl group are more preferable, and the rinse agent composition for steel sheet according to any one of the above items <1> to <11> object.
<13> The above m is 1 or more, preferably 3 or more, more preferably 10 or more, and 100 or less, preferably 50 or less, more preferably 40 or less, and further preferably 30 or less. <12> The rinse agent composition for steel sheets according to any one of the above.
<14> The concentration of the component (b) in the rinse agent composition for steel sheet is preferably 1 mg / kg or more, more preferably 3 mg / kg or more, and preferably 500 mg / kg or less, more preferably 300 mg / kg or less. Preferably, 200 mg / kg or less is further preferred, 100 mg / kg or less is more preferred, 80 mg / kg or less is more preferred, and 50 mg / kg or less is still more preferred. Any one of <1> to <13> A rinsing agent composition for steel sheets.
<15> The mass ratio ((a) / (b)) between the component (a) and the component (b) is preferably 0.1 or more, more preferably 0.5 or more, and even more preferably 1.0 or more. 2.0 or more is still more preferable, 15 or less is preferable, 10 or less is more preferable, and 7.0 or less is still more preferable, The rinse agent composition for steel plates in any one of said <1>-<14> object.
<16> The number of carbon atoms of R ⁶ is 10 or more, 22 or less, preferably 12 or more, more preferably 16 or more, and preferably 20 or less, more preferably 18 or less, <1> to <15> The rinse agent composition for steel sheets according to any one of the above.
<17> The hydrocarbon group of R ⁶ is preferably a decyl group, a lauryl group, a myristyl group, a palmityl group, a stearyl group, an isostearyl group, a behenyl group, or an oleyl group, and a lauryl group, a myristyl group, a palmityl group, or a stearyl group. The rinsing agent composition for steel sheet according to any one of <1> to <16>, wherein an oleyl group is more preferable, and a stearyl group and an oleyl group are further preferable.
<18> The component (c) is polyoxyethylene decylamine, polyoxyethylene laurylamine, polyoxyethylene myristylamine, polyoxyethylene palmitylamine, polyoxyethylene stearylamine, polyoxyethylene isostearylamine, polyoxy Ethylene behenylamine, polyoxyethylene oleylamine, polyoxyethyleneoxypropylene laurylamine, polyoxyethyleneoxypropylene myristylamine, polyoxyethyleneoxypropylene palmitylamine, polyoxyethyleneoxypropylene stearylamine, polyoxyethyleneoxypropylene isostearylamine , Polyoxyethyleneoxypropylene behenylamine, polyoxyethyleneoxypropylene oleylamine , Polyoxyethyleneoxybutylene stearylamine, polyoxyethyleneoxybutylene isostearylamine, polyoxyethyleneoxybutylene behenylamine, polyoxyethyleneoxybutylene oleylamine are preferred, polyoxyethylene laurylamine, polyoxyethylene myristylamine, polyoxyethylene Any of <1> to <17>, wherein palmitylamine, polyoxyethylene stearylamine, polyoxyethyleneisostearylamine, and polyoxyethyleneoleylamine are more preferable, and polyoxyethylenestearylamine and polyoxyethyleneoleylamine are more preferable. The rinse agent composition for steel plates as described in 2.
<19> The number of carbon atoms of the A ² O is preferably 2 or more, preferably 4 or less, more preferably 3 or less, and even more preferably 2, according to any one of <1> to <18>. A rinsing agent composition for steel sheets.
<20> The rinsing agent composition for steel sheet according to any one of <1> to <19>, wherein the A ² O is preferably an ethyleneoxy group, a propyleneoxy group, and more preferably an ethyleneoxy group.
The total (e + f) of average addition mole number (average polymerization degree) of <21> alkyleneoxy group is preferably 1 or more, more preferably 2 or more, still more preferably 4 or more, and preferably 20 or less. The rinsing agent composition for steel sheet according to any one of <1> to <20>, preferably 10 or less, more preferably 6 or less.
<22> An ethyleneoxy group having a total average added mole number (e + f) of an alkyleneoxy group (e + f) of 1 to 20 and an average added mole number (e + f) of 1 to 20 The following ethyleneoxy groups and propyleneoxy groups, the total number of added moles (e + f) of 1 to 20 ethyleneoxy groups and butyleneoxy groups, preferably the sum of the average number of added moles (e + f) of 1 to 10 The rinse agent composition for steel sheets according to any one of <1> to <21>, which is an ethyleneoxy group.
<23> The concentration of the component (c) in the rinse agent composition α is preferably 1 mg / kg or more, more preferably 3 mg / kg or more, preferably 500 mg / kg or less, more preferably 300 mg / kg or less, 200 mg / kg. The steel sheet rinse according to any one of <1> to <22>, further preferably not more than kg, more preferably not more than 100 mg / kg, still more preferably not more than 50 mg / kg, and still more preferably not more than 30 mg / kg. Agent composition.
<24> The mass ratio of the component (b) to the component (c) (component (b) / component (c)) is 0.20 or more, more preferably 0.40 or more, and still more preferably 0.80 or more. And preferably 9.0 or less, more preferably 4.5 or less, still more preferably 2.0 or less, and still more preferably 1.2 or less, in any one of the above items <1> to <23> The rinse agent composition for steel plates as described.
<25> The mass ratio ([component (a) / [component (b) + component (c)]]) of the component (a), the component (b) and the component (c) is preferably 0.00. 80 or more, more preferably 1.5 or more, still more preferably 1.6 or more, preferably 9.0 or less, more preferably 4.0 or less, still more preferably 3.2 or less, and even more preferably 2. The rinse agent composition for steel plates according to any one of <1> to <24>, which is 5 or less.
<26> After washing step (1) for washing the steel sheet after cold rolling, rinsing step (2) for the steel plate after the washing step (1), and after the rinsing step (2) A method for producing a steel plate including a drying step (3) for drying the steel plate, wherein the rinsing step (2) includes one or more rinsing processes, and the last rinsing process is any one of <1> to <25> The manufacturing method of a steel plate using the rinse agent composition for steel strips described in 1.
<27> Use of the composition according to any one of <1> to <25> in the production of a steel sheet.

  EXAMPLES Hereinafter, although an Example demonstrates this invention in more detail, this invention is not limited at all by these Examples.

[Examples A-1 to A-5, Comparative Example A-1]
(Preparation of detergent)
Sodium hydroxide 2% by mass, sodium gluconate 0.16% by mass, ethylenediaminetetraacetate 0.05% by mass, polyoxyethylene dodecyl ether 0.1% by mass, sodium polyacrylate 0.05% by mass, water 97. An aqueous solution in which 64% by mass was added and mixed was used as the cleaning agent A.

[Preparation of rinse agent composition]
The total amount of each component of oleylamine and acetic acid as component (a) when heated to 60 ° C., nonionic surfactant as component (b) and component (c) shown in Table 1 is 18% by mass. The concentrate was adjusted by adding until the oleylamine was dissolved. In the test, it was used after diluting (4500 times) to the concentration shown in the table.

C ₁₈ H ₃₇ O (EO) ₁₂ (PO) ₂₁ H (random) in Table 1 is a compound (HLB1.9) obtained by randomly adding 12 mol of ethylene oxide and 21 mol of propylene oxide to 1 mol of stearyl alcohol. In the general formula (2), R ⁵ is a linear alkyl group having 18 carbon atoms, A ¹ O is an ethyleneoxy group and a propyleneoxy group, and m is 33. The polyoxyethylene laurylamine (EO2) in Table 1 is a compound obtained by adding 2 mol of ethylene oxide to 1 mol of laurylamine. In the general formula (3), R ⁶ is an alkyl group having 12 carbon atoms, A ² O is an ethyleneoxy group and e + f is 2. The polyoxyethylene stearylamine (EO2) in Table 1 is a compound obtained by adding 2 mol of ethylene oxide to 1 mol of stearylamine. In the general formula (3), R ⁶ is an alkyl group having 18 carbon atoms, A ² O is an ethyleneoxy group and e + f is 2. The polyoxyethylene oleylamine (EO5) in Table 1 is a compound obtained by adding 5 mol of ethylene oxide to 1 mol of oleylamine. In the general formula (3), R ⁶ is an alkenyl group having 18 carbon atoms, and A ² O is Ethyleneoxy group, e + f is 5.

[Evaluation of drainability]
<Washing process: alkali cleaning>
Cold rolled steel sheet (dirt: iron powder and rolling oil) with a thickness of 70 mm cut to a length of 70 mm and a width of 100 mm is immersed in the cleaning agent A in the alkali cleaning tank (immersion time 2 seconds), and the alkali cleaning tank Pulled up from.

<Washing process: Electrolytic cleaning>
The steel plate subjected to the alkali cleaning step is immersed in the cleaning agent A in an electrolytic cleaning tank, and subjected to electrolytic cleaning (electrolytic time 1 second, switching interval between negative electrode and positive electrode 0.5 seconds each, current density 10 A / dm ^2. ) And pulled up from the electrolytic cleaning tank.

<Washing process: Brush cleaning>
While spraying water (25 ° C.) at a spray pressure of 0.2 MPa and a spray amount of 5 L / min, using a nozzle (spray nozzle 1/4 MVE11578 manufactured by Ikeuchi Co., Ltd.) Brush cleaning was performed with a brush roll cleaning tester (manufactured by Showa Kogyo Co., Ltd., nylon brush, brush rotation speed 600 rpm, brush rolling 2.5 mm, steel plate feed rate 100 m / min).

<Rinse process: spray rinse treatment>
The rinse agent composition shown in Table 1 with a spray pressure of 0.2 MPa and a spray amount of 5 L / min was used for the steel plate after the brush cleaning step was performed using a nozzle (spray nozzle 1 / 4MJ100NBW manufactured by Ikeuchi Co., Ltd.) 25 ° C.) was sprayed onto a steel plate. Then, the surface of the steel plate treated with the rinse agent was held for 5 seconds so as to be perpendicular to the ground.

<Drying process>
The steel plate after the rinsing step was dried using an EDM dryer manufactured by Wingo Seiki Co., Ltd. The drying operation was performed for about 15 seconds at a position about 10 cm away from the nozzle with the dryer switch set to the HEAT side, and moisture was removed so that water droplets on the surface of the steel plate disappeared visually. In the production of a steel plate, usually, the steel plate is further heated and then dried.

<Measurement of amount of attached water>
Immediately after the rinsing step, the mass of the steel sheet and the mass of the steel strip after air blowing were measured. The difference, that is, the amount of attached water was calculated by the following formula, and the amount of attached water per unit area (g / m ² ) was obtained.
[Amount of adhered water (g)] = [Mass of steel strip after rinsing step (g)] − [Mass of dry steel strip after air blowing (g)]

  The results are shown in Table 1.

Claims (4)

The following general formula (1):

(Wherein R ¹ represents a hydrocarbon group having 6 to 22 carbon atoms, R ² represents a hydrogen atom or a hydrocarbon group having 1 to 22 carbon atoms, R ³ and R ⁴ are the same or different, .X indicating the atom or having 1 or more carbon atoms of 3 or less hydrocarbon groups ^- from component (a) is at least one selected from compounds represented by represents an inorganic anion or an organic anion).
The following general formula (2):
R ⁵ —O— (A ¹ O) _m H (2)
(In the formula, R ⁵ is a linear or branched alkyl group or alkenyl group having 8 to 20 carbon atoms, A ¹ O is an alkyleneoxy group having 2 to 4 carbon atoms, m represents an average added mole number, A number of 1 to 100. m A ¹ Os may be the same or different from each other.) The component (b) is at least one selected from the compounds represented by:
The following general formula (3):

(In the formula, R ⁶ is a hydrocarbon group having 10 to 22 carbon atoms, A ² O is an alkyleneoxy group having 2 to 4 carbon atoms, and e and f each represent an average added mole number of A ² O. e Is a number of 1 or more, f is a number of 0 or more, and e and f A ² O may be the same or different.) The rinse agent composition for steel plates containing c).   The rinsing agent composition for steel sheet according to claim 1, wherein the total (e + f) of the average number of added moles of the alkyleneoxy group of component (c) is at least one selected from ethylene oxide adducts of 1 or more and 10 or less. A cleaning step (1) for cleaning the steel sheet after cold rolling;
Rinsing step (2) after the washing step (1)
A method for producing a steel sheet comprising a drying step (3) for drying the steel plate after the rinsing step (2) has been performed,
The said rinsing process (2) includes the rinse process of 1 or more, The manufacturing method of the steel plate using the rinse agent composition for steel strips of Claim 1 or 2 for the last rinse process.   In the rinsing step (2), the concentration of the component (a) is 5 mg / kg to 1000 mg / kg, the concentration of the component (b) is 1 mg / kg to 500 mg / kg, and the concentration of the component (c) is 1 mg. The manufacturing method of the steel plate of Claim 3 which is 500-500 mg / kg / kg or more.