JP2009291890A - Barrel polishing detergent - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a barrel polishing detergent to be used for wet type barrel polishing of a metal article, having compatibly improved performance of removing contamination such as machining oil or scales deposited on the metal article, performance of smoothing the metal surface, and performance of dressing it to improve gloss while sufficiently reducing ill effects on the metal surface, including rust or discoloration on the surface. <P>SOLUTION: The barrel polishing detergent contains N-long-chain acylamino acid surface active agent. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a barrel polishing detergent, and more particularly to a barrel polishing detergent used for wet barrel polishing of metal articles.

  In general, operations such as polishing, deburring, chamfering, polishing, and removal of deposits such as metal working oil and scale are performed by mechanical polishing using an abrasive. One such mechanical polishing is barrel polishing.

  In barrel polishing, an object to be polished and a medium (that is, an abrasive) are put into the barrel, and the barrel is vibrated or rotated to allow mutual contact between the object to be polished and the medium or between objects to be polished. Friction is generated and the surface of the object to be polished is polished. The barrel polishing includes wet barrel polishing in which water is poured into the barrel and dry barrel polishing in which water is not charged.

As for wet barrel polishing, a method has been proposed in which a surfactant is added into a barrel in addition to an object to be polished, a medium and water to perform polishing. For example, in Patent Document 1 below, non-ionic surfactants such as polyoxyethylene sorbitan fatty acid esters, anionic surfactants such as fatty acid salts, or amphoteric surfactants such as betaine are added in wet barrel polishing of ceramic electronic components. Is disclosed. Patent Document 2 below discloses that a composition containing a higher fatty acid N-methyltaurine salt and cationized cellulose is used for wet barrel polishing of ceramics.
JP-A-5-13261 JP 2005-305624 A

  The addition of a surfactant can be expected to facilitate removal of deposits such as metalworking oil and scale. However, if there are many bubbles, there are problems such as work overflowing from the wet barrel polishing apparatus and a problem that the load during waste water treatment increases. Further, according to the study by the present inventors, the surfactants described in Patent Documents 1 and 2 have insufficient finish properties such as smoothness and gloss on the surface of an object to be polished, particularly the surface of a metal article. In some cases, the effect of improving the dirt removal property may not be sufficiently obtained.

  Furthermore, in wet barrel polishing of metal articles, the polished metal surface reacts with water, oxygen, etc. in the barrel during polishing, and as a result, metal oxide and metal hydroxide (so-called rust) are generated, There is a problem that the metal surface changes to a specific color.

  In the inventions of Patent Documents 1 and 2, since the object to be polished is ceramics, the above problem has not been studied. Therefore, when the surfactants described in Patent Documents 1 and 2 are applied to wet barrel polishing of metal articles, the problem of rust and discoloration on the metal surface may further increase. In such a case, it is necessary to use a large amount of a rust preventive agent, and it is necessary to wash the surfactant remaining after polishing with clean water, resulting in a decrease in economic efficiency and complicated process in barrel polishing. End up.

  The present invention has been made in view of the above circumstances, and is a cleaning agent used for wet barrel polishing of metal articles, and has a sufficiently small adverse effect on the metal surface such as rust and discoloration on the surface. An object of the present invention is to provide a cleaning agent for barrel polishing that is excellent in both removal of dirt such as processing oil and scale adhered to an article, and finishing properties that improve the smoothness and gloss of a metal surface.

  As a result of intensive studies to solve the above-mentioned problems, the present inventors have used a specific surfactant for wet barrel polishing of metal articles, without adversely affecting the surface of the object to be polished. The present inventors have found that the stains adhering to the surface can be sufficiently removed and the smoothness and gloss can be improved, and the present invention has been completed.

  That is, the barrel polishing detergent of the present invention contains an N-long chain acylamino acid type surfactant.

  According to the barrel polishing detergent of the present invention, when used as a cleaning agent for wet barrel polishing of metal articles, dirt such as processing oil and scale attached to the metal articles is sufficiently removed, and the smoothness of the metal surface The gloss can be sufficiently improved and the occurrence of rust and discoloration on the surface can be sufficiently suppressed.

  The reason why the cleaning agent for barrel polishing of the present invention has the above-mentioned effect is not clear, but the present inventors speculate as follows. That is, the long-chain acyl group and the carboxyl group of the N-long-chain acylamino acid surfactant contained in the barrel polishing detergent of the present invention are oriented on the metal surface, and the rust-preventing effect of suppressing the oxidation reaction on the metal surface The present inventors speculate that this is exhibited. In addition, N-long chain acylamino acid type surfactants are difficult to foam and have fine foaming, so that they provide an appropriate buffer for mutual friction between the metal article and the medium (abrasive), so that processing oil, scale, etc. It can be inferred that it was possible to achieve both a high level of removability that can smoothly remove dirt and finishes such as deburring, rounding, smooth finishing, and gloss finishing of metal surfaces.

  Further, according to the barrel polishing detergent of the present invention, the N-long chain acylamino acid type surfactant has an appropriate foaming property and excellent biodegradability, so that the effect of the present invention can be obtained. However, compared with a surfactant-containing cleaning agent that does not have the configuration of the present invention, it is possible to reduce the load during wastewater treatment and improve the working environment.

  In the barrel polishing detergent of the present invention, the N-long chain acylamino acid type surfactant is N-long chain acyl glutamic acid, N-long chain acyl aspartic acid, N-long chain acyl sarcosine, N-long chain acyl- It is preferably at least one selected from the group consisting of β-alanine, N-long chain acyl-N-methyl-β-alanine, and salts thereof.

  Further, the N-long chain acylamino acid type surfactant is preferably at least one selected from N-long chain acylglutamic acid and salts thereof.

  Further, the barrel polishing detergent of the present invention may further contain a nonionic surfactant.

  According to the present invention, it is a cleaning agent used for wet barrel polishing of metal articles, and has a sufficiently small adverse effect on the metal surface such as the occurrence of rust and discoloration on the surface. It is possible to provide a cleaning agent for barrel polishing which is excellent in both removal of dirt and finish which improves the smoothness and gloss of the metal surface.

  The barrel polishing detergent of the present invention is characterized by containing an N-long chain acylamino acid type surfactant.

  N-long chain acyl amino acid type surfactants include N-long chain acyl glutamic acid, N-long chain acyl aspartic acid, N-long chain acyl sarcosine, N-long chain acyl-β-alanine, N-long chain acyl It is preferable to use one or more selected from the group consisting of —N-methyl-β-alanine and salts thereof. Examples of the salt include sodium salt, potassium salt, and alkanolamine salt.

  Here, the long chain acyl group preferably has 8 to 36 carbon atoms, and preferably 12 to 18 carbon atoms. If the carbon number of the long-chain acyl group is within this range, rust and discoloration of the metal surface can be sufficiently suppressed, and the metal surface dirt removal property, smoothness and finish are further excellent. Barrel polishing detergent can be realized.

  In the barrel polishing detergent of the present invention, the N-long chain acylamino acid type interface is particularly good in terms of finishes such as surfactant biodegradability, metal surface dirt removal, smoothness and gloss. As the activator, it is particularly preferable to contain one or more selected from N-long chain acylglutamic acid and salts thereof.

  The content of the N-long chain acylamino acid surfactant in the barrel polishing detergent of the present invention is not particularly limited, but is preferably 2% by mass or more based on the total amount of the detergent, and 5% by mass or more. More preferably. When the content of the N-long chain acylamino acid type surfactant is less than the above range, the effects of the present invention may not be sufficiently exhibited. The upper limit of the content of the N-long chain acylamino acid type surfactant is not particularly limited, but the upper limit is set to 70% by mass in order to improve the dilution property of the barrel polishing detergent into water. It is preferable to make it up to 50% by mass.

  Further, the barrel polishing detergent of the present invention preferably further contains a nonionic surfactant in addition to the N-long chain acylamino acid type surfactant. By using a nonionic surfactant in combination, it is possible to further improve the removability of dirt such as processing oil and scale attached to the metal article, and the anti-reattachment property to suppress the reattachment of the removed dirt to the metal article. Can do. Further, by using a nonionic surfactant in combination, the finish of the metal article such as smoothness and gloss can be further improved.

  Nonionic surfactants include, for example, alkylene oxide adducts of glycols and alcohols and esterified products thereof, alkylene oxide adducts of fatty acids, alkylene oxide adducts of amines or amides and esterified products thereof, and polyhydric alcohols. Suitable examples include fatty acid esters and fatty acid alkanolamides. These can be used alone or in combination of two or more.

  Among the above nonionic surfactants, it is preferable to use an alkylene oxide adduct of glycols or alcohols or an esterified product thereof from the viewpoint of excellent soil removability and anti-reattachment properties. From the viewpoint of the finish and antirust effect, it is preferable to use a fatty acid alkanolamide.

As the alkylene oxide adducts of glycols and alcohols and esterified products thereof, compounds represented by the following general formula (1) are more preferable.
R ¹ O (AO) _n R ² (1)
In formula (1), R ¹ represents a hydrogen atom or a saturated or unsaturated hydrocarbon group having 1 to 24 carbon atoms, and R ² represents a hydrogen atom or an acyl group having 2 to 24 carbon atoms. A represents an alkylene group having 2 to 4 carbon atoms, n is an integer of 1 to 50, more preferably an integer of 1 to 20 (provided that when both R ¹ and R ² are hydrogen atoms, n is 5 to 5). An integer of 50). When two or more A exists in 1 molecule, A may be same or different, and when it is a copolymer, it may be a block copolymer or a random copolymer.

  The fatty acid alkanolamide is preferably a monoalkanolamide or dialkanolamide of a saturated or unsaturated fatty acid having 8 to 36 carbon atoms, particularly preferably diethanolamide.

  In the barrel polishing detergent of the present invention, when the nonionic surfactant is used in combination with the N-long chain acylamino acid type surfactant, the N-long chain acylamino acid type surfactant is used in an amount of 1 part by mass. The nonionic surfactant is preferably used at a blending ratio of 1 to 3 parts by mass.

  In addition to the above-described components, conventionally known anionic surfactants can be blended with the barrel polishing detergent of the present invention within a range that does not impair the effects of the present invention. Although it does not specifically limit as an anionic surfactant, For example, carboxylate types, such as a fatty acid salt; Alkylbenzene sulfonate, alkyl naphthalene sulfonate, alpha-olefin sulfonate, sulfosuccinic acid diester, etc. Sulfate type; sulfates of higher alcohol sulfates, sulfates of higher alcohol alkylene oxide adducts, sulfates of sulfated oils, sulfated olefins, etc .; higher alcohol phosphates, phosphorus of higher alcohol alkylene oxide adducts Examples include phosphate ester salt type anionic surfactants such as acid ester salts.

  In addition, the barrel polishing detergent of the present invention may be appropriately mixed with components used for metalworking chemicals, such as rust preventives, antifoaming agents, corrosion inhibitors, and lubricants, as necessary. Can do.

  The barrel polishing detergent of the present invention is used by adding it to the barrel device together with the object to be polished, media and water.

  Examples of the object to be polished include metal articles made of metals such as iron, aluminum, zinc, and copper, and alloys such as brass and stainless steel. The cleaning agent for barrel polishing of the present invention is particularly suitable for wet barrel polishing of cast products, die cast products, and sintered products.

  Examples of the media include ceramic media such as alumina fine particles, metal media, plastic media, and plant-based media.

  The barrel apparatus to which the barrel polishing detergent of the present invention can be applied is not particularly limited as long as it is wet, and examples thereof include a rotating barrel apparatus, a vibrating barrel apparatus, a fluidized barrel apparatus, and a centrifugal barrel apparatus.

  The addition amount of the barrel polishing detergent of the present invention can be appropriately adjusted according to the type and amount of dirt such as processing oil and scale adhered to the surface of the metal article, and the required effect. It is preferable to add so that the concentration of the N-long chain acylamino acid type surfactant is 0.05 to 5.0% by mass based on the total amount of water and the barrel polishing detergent.

  The barrel polishing detergent of the present invention is added to the barrel during wet barrel polishing of a metal article, so that the processing oil and scale adhered to the metal article without adverse effects such as rust and discoloration on the surface of the metal article. Etc. can be removed, and finishing properties such as smoothness and gloss of metal articles can be improved.

  Further, when the barrel polishing detergent of the present invention is applied to barrel polishing of a metal article, it is not necessary to rewash the metal article after barrel polishing with clean water, and the polishing process can be simplified. The ability to omit the rewashing step is also preferable from the viewpoint of rust prevention on the surface of the metal article.

  Further, the material of the barrel device itself is often a metal, but the barrel polishing detergent of the present invention can also suppress adverse effects such as the occurrence of rust on the barrel.

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

<Preparation of barrel polishing detergent>
(Example 1)
30 g of N-coconut oil fatty acid acyl-L-glutamic acid triethanolamine salt and 70 g of water were uniformly mixed to obtain a barrel polishing detergent.

(Example 2)
30 g of N-lauroyl-L-glutamic acid sodium salt and 70 g of water were uniformly mixed to obtain a barrel polishing detergent.

(Example 3)
30 g of N-stearoyl-L-glutamic acid potassium salt and 70 g of water were uniformly mixed to obtain a barrel polishing detergent.

(Example 4)
N-coconut oil fatty acid acyl-L-glutamic acid triethanolamine salt (10 g), tripropylene glycol monomethyl ether (20 g) and water (70 g) were mixed uniformly to obtain a barrel polishing detergent.

(Example 5)
N-coconut oil fatty acid acyl-L-glutamic acid triethanolamine salt (10 g), oleic acid diethanolamide (1: 1 mol type) (20 g) and water (70 g) were uniformly mixed to obtain a barrel polishing detergent.

(Example 6)
10 g of N-coconut oil fatty acid acyl-L-glutamic acid triethanolamine salt, 10 g of oleic acid diethanolamide (1: 1 mol type), 10 g of ethylene oxide 4 mol adduct of primary alcohol having 12 to 14 carbon atoms and water 70 g was uniformly mixed to obtain a barrel polishing detergent.

(Comparative Example 1)
30 g of tripropylene glycol monomethyl ether and 70 g of water were uniformly mixed to obtain a barrel polishing detergent.

(Comparative Example 2)
30 g of oleic acid diethanolamide (1: 1 mol type) and 70 g of water were uniformly mixed to obtain a barrel polishing detergent.

(Comparative Example 3)
30 g of an ethylene oxide 4 mol adduct of a primary alcohol having 12 to 14 carbon atoms and 70 g of water were uniformly mixed to obtain a barrel polishing detergent.

(Comparative Example 4)
Palm fatty acid N-methyl taurine sodium salt 10 g and water 90 g were mixed uniformly to obtain a barrel polishing detergent.

(Comparative Example 5)
10 g of polyoxyethylene (10 mol) sorbitan oleic acid monoester and 90 g of water were uniformly mixed to obtain a barrel polishing detergent.

(Comparative Example 6)
10 g of lauryl dimethylamine oxide and 90 g of water were uniformly mixed to obtain a barrel polishing detergent.

<Evaluation of cleaning agent for barrel polishing>
For the barrel polishing detergents obtained in the examples and comparative examples, in accordance with the following method, the foaming property of the barrel polishing detergent, the removal of dirt adhered to the metal article and the anti-reattachment property, the metal surface The gloss and smoothness, and the rust prevention property of the metal were evaluated. The “barrel polishing detergent diluted 100 times with water” refers to a mixture of 99 parts by mass of water with 1 part by mass of the barrel polishing detergent.

(1) Foamability of barrel polishing detergent 50 mL barrel polishing detergent diluted 100 times with water is placed in a 100 mL graduated cylinder, shaken vigorously 50 times up and down, and allowed to stand 5 minutes later The height (mm) of the foam was measured.

(2) Dirt removal and anti-re-adhesion properties Mix 1g of metal processing oil "Cosmo Clean Press AK620" (trade name, manufactured by Cosmo Oil Lubricants Co., Ltd.) with 100g of barrel polishing detergent diluted 100 times with water. did. A clean SPCC-SB steel plate (length 50 mm × width 25 mm × thickness 1 mm) was lifted with tweezers, swung left and right 10 times while immersed in the above mixture, and then washed with running water for 30 seconds.

  This operation was regarded as one treatment, and this was repeated 5 times. In the SPCC-SB rigid plate after the treatment, the area ratio (%) to which the metal working oil was adhered was observed. It is evaluated that the smaller the area to which the metal processing oil is attached, the better the dirt removal property and the anti-reattachment property.

(3) Gloss of metal surface 100 g barrel cleaning agent diluted 100 times with water, one super elastic steel plate (length 50 mm x width 25 mm x thickness 3 mm) and 200 g ceramic media (φ1 mm) in a 250 mL plastic container The plate was shaken with a “paint conditioner” (trade name, manufactured by Red Devil) for 30 minutes, and then the steel plate was taken out and dried at 105 ° C. for 30 minutes. The gloss of the steel sheet after drying was measured with a 60 ° gloss meter (manufactured by MINOLTA, CHROMA METER CR-200). The higher the measured value, the better the gloss, and the better the gloss in this evaluation, the better the surface smoothness.

(4) Smoothness of metal surface The surface roughness (ten-point average roughness R _Z (μm)) of the steel sheet obtained by the same operation as in (3) was determined as “Form Talysurf S3C” (made by Taylor Hobson, The product name was measured according to JIS B 0601 (1994). Incidentally, as the smoothness of _{R 2 (μm)} is smaller is better.

(5) Rust prevention of metal A clean SPCC-SB steel plate (length 50 mm x width 25 mm x thickness 1 mm) is immersed in 100 g of barrel polishing detergent 100 times diluted with water and left at 45 ° C for 1 day. did. Then, the steel plate was taken out and the occurrence of rust on the surface was visually observed and evaluated in the following three stages. The rust prevention is so excellent that there is no rust.
“◯”: No rust was observed on the steel sheet.
“Δ”: Some rusting is observed on the steel sheet.
“×”: Rust is generated on the entire surface of the steel sheet.

  The barrel polishing detergent of the present invention is applicable to wet barrel polishing of metal parts such as automobile parts, OA equipment parts, home appliance parts, communication equipment parts, precision machine parts, etc., and is used for wet barrel equipment. In addition, dirt attached to the metal part can be removed without adversely affecting the surface of the metal part, and the smoothness and gloss of the metal surface can be improved. In addition, since the barrel polishing detergent of the present invention is excellent in rust prevention properties, it does not require the use of a rust inhibitor or re-washing with water after polishing metal articles, and simplifies the polishing process. be able to.

Furthermore, since the barrel polishing detergent of the present invention is mainly composed of a highly biodegradable N-long chain acylamino acid type surfactant, it is intended to reduce the environmental burden and improve the working environment during wastewater treatment. Can do.

Claims (4)

  A barrel polishing detergent comprising an N-long chain acylamino acid type surfactant.   The N-long chain acyl amino acid type surfactant is N-long chain acyl glutamic acid, N-long chain acyl aspartic acid, N-long chain acyl sarcosine, N-long chain acyl-β-alanine, N-long chain acyl. The cleaning agent for barrel polishing according to claim 1, which is at least one selected from the group consisting of -N-methyl-β-alanine and salts thereof.   The barrel polishing detergent according to claim 1, wherein the N-long chain acylamino acid type surfactant is at least one selected from N-long chain acylglutamic acid and salts thereof. The barrel polishing detergent according to any one of claims 1 to 3, further comprising a nonionic surfactant.