JP2012081492A - Spatter adhesion preventive agent - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a welding spatter adhesion preventive agent for preventing adhesion of spatter scattered during welding a steel member or the like, to a peripheral portion of a welded part.SOLUTION: The spatter adhesion preventive agent contains an inorganic film forming liquid, particularly contains the hydrolyzed/polycondensed product of a compound represented by M(OR)R(in the formula, M is at least one kind of element selected from a group consisting of Al, Zr and Ti; p is a valence of M; Ris a 1 to 5C hydrocarbon group, alkoxyalkyl group or acyl group; Ris at least one kind of organic group selected from a group consisting of vinyl, amino, imino, epoxy, acryloyloxy, methacryloyloxy, phenyl, mercapto and alkyl groups; q is a number of ORgroups; p and q are each integers; and p≥q).

Description

  TECHNICAL FIELD The present invention relates to a welding spatter adhesion preventive agent for preventing spatter scattered when welding a steel material or the like from adhering to a peripheral portion of a welding location.

The welding spatter generated during welding adheres to the product or jig, and it is necessary to peel off the spatter after welding.
In Patent Document 1, one or more salts selected from alkali metal salts of silicic acid; fluoride ions, hydrogen carbonate ions; and insoluble alcohols or derivatives thereof are blended in water, and other types are appropriately added. Weld spatter adhesion inhibitors with additives are provided.
Patent Document 2 discloses a weld spatter adhesion inhibitor containing fine powders of inorganic substances or inorganic compounds, and further selected from the group consisting of water; dicarboxylic acids; metal hydrides; triazoles, chelating agents, saturated fatty acids, and unsaturated fatty acids. There has been proposed a weld spatter deposition inhibitor comprising a mixed liquid comprising one or more of the above-described substances.
Patent Document 3 proposes a composition for forming a ceramic film and a spatter adhesion preventing agent to which a metal oxide filler is added.

JP 2000-176680 A JP-A-2005-324217 JP2010-075990

When performing arc welding, spot welding, laser welding, etc., spatter scatters and adheres to the product and peripheral members, and the spatter adhered in the subsequent process must be removed. In particular, when the product adheres to the product, not only the appearance of the product is impaired, but there is a possibility that the product may not be stably manufactured due to the spatter that is attached when the product is incorporated and used as a final product. Moreover, when adhering to a peripheral member, especially when adhering to a jig for positioning, accurate positioning cannot be performed at the time of welding, and the possibility of producing a defective product increases. Therefore, after performing welding to some extent, an operation of removing spatters manually using a chisel or the like is performed, and the number of man-hours spent for the removal operation is enormous.
Patent Document 1 is effective in preventing welding spatter from adhering to products, but the effect of preventing adhering to peripheral members is not very durable, so it is necessary to continuously and frequently apply an anti-spatter agent. It becomes.
In Patent Document 2, although the effect of preventing spatter adhesion is strengthened compared to Patent Document 1, the effect of preventing adhesion to peripheral members is not particularly changed with respect to sustainability.
In Patent Document 3, the effect of preventing spatter adhesion is strengthened, but the effect becomes lower under severer welding conditions in the vicinity of the welded portion, and the sustainability is shortened accordingly. In addition, the spatter adhesion preventive agent using silicon is likely to be adversely affected on other processes such as paint repelling, and is easily avoided at the site of use.

  In order to solve the above-mentioned problems, the present invention provides a spatter adhesion preventing agent containing an inorganic film forming liquid.

The inorganic film forming liquid used in the present invention includes an inorganic film forming liquid containing a hydrolysis / polycondensate of the compound represented by the formula (1).
M ^{p +} (OR ¹ ) _q R ² _p-q (1)
Wherein M is at least one element selected from the group consisting of Al, Zr and Ti; R ¹ is a hydrocarbon group having 1 to 5 carbon atoms, an alkoxyalkyl group, or an acyl group R ² is at least one organic group selected from the group consisting of vinyl, amino, imino, epoxy, acryloyloxy, methacryloyloxy, phenyl, mercapto and alkyl groups; p represents the valence of M; Represents the number of OR ¹ groups; p and q are both integers; p ≧ q.)

Among the compounds represented by M ^{p +} (OR ¹ ) _q R ² _p-q , the compound in which M is Al includes aluminum triisopropoxide, aluminum n-butoxide, aluminum tri-t-butoxide, aluminum triethoxy. Examples of the compound in which M is Zr include zirconium n-propoxide, zirconium n-butoxide, zirconium i-butoxide, zirconium t-butoxide, zirconium dimethacrylate dibutoxide, and the like. Some compounds include titanium tetraisopropoxide, titanium tetra n-butoxide, titanium tetra i-butoxide, titanium methacrylate triisopropoxide, titanium tetramethoxypropoxide, titanium tetra n-propoxide, titanium tetraeth Sid and the like. Only one of these compounds may be used, but two or more may be mixed.
The hydrolysis and polycondensation reaction of the compound of the formula (1) can be performed by a known method as described in, for example, JP-A-2001-214093.
The amount of water added to perform the hydrolysis / polycondensation reaction is preferably 0.1 mol or more per 1 mol of the compound of the formula (1).
When the compound of formula (1) is subjected to hydrolysis / condensation polymerization, a known catalyst or the like may be added to promote hydrolysis / condensation polymerization. In this case, as the catalyst to be added, organic acids such as acetic acid, propionic acid and butyric acid, and inorganic acids such as nitric acid, hydrochloric acid, phosphoric acid and sulfuric acid can be used.

The hydrolysis / polycondensation product of M ^{p +} (OR ¹ ) _q R ² _p-q is preferably liquid. However, solid hydrolyzate / polycondensate can be used as long as it becomes liquid by addition of a solvent.

  By setting the spatter adhesion preventing agent to the above composition, the following advantageous effects can be obtained. That is, when the spatter adhesion preventing agent is applied, the organic group remains in the structure as shown in FIG. 1 and can be removed with an organic solvent during subsequent removal. Further, heat is applied to the coating at the portion where the spatter hits in the vicinity of welding, and a ceramic coating is formed to improve the strength and increase the durability.

  Further, a ceramic filler or a ceramic sol may be appropriately added as an auxiliary agent to the spatter adhesion preventing agent. Examples of the ceramic filler include oxides such as alumina, zirconia, and titania, nitrides such as boron nitride and aluminum nitride, and carbides such as silicon carbide and tungsten carbide, and one or more may be added in combination. The filler may be added alone or in the form of a dispersion (slurry). In order to improve the dispersibility of the ceramic filler, a dispersant such as a surfactant may be added. Examples of the ceramic sol include silica sol, alumina sol, titania sol, zirconia sol, and the like.

  Moreover, the solvent for the spatter adhesion preventing agent is not particularly specified, but considering the drying property after coating, alcohols such as ethanol, isopropanol and 1-propanol, alkoxyethanols, ethylene glycol monoalkyl ether And propylene glycols are preferred.

  Furthermore, the viscosity may be adjusted in order to improve the coating property and workability of the spatter adhesion preventing agent. As a method for adjusting the viscosity, the viscosity may be adjusted by the filler concentration or the solvent type. An appropriate amount of thickener may be added.

  The method for applying the spatter adhesion preventing agent is not particularly specified, but brushing, spraying, etc. are preferably applied to the necessary portions. Further, the spatter adhesion preventing agent can be aerosolized, and can be applied regardless of the installation environment of the welding machine by aerosolizing in advance.

  Further, the spatter adhesion preventing agent may be colored. When it is necessary to color and distinguish the applied part for alerting at the welding site or identification in the manufacturing process, the coating film is colored and the two effects of identification and spatter adhesion prevention are simultaneously achieved. Can be granted. For example, as a method of coloring, a colorant is added and a desired color is added. Examples of the colorant include inorganic pigments, organic pigments, and organic dyes. Organic pigments and organic dyes burn partly due to spattering and cause fading or scorching. This is useful for measuring the timing of re-application.

  If the spatter adhesion preventing agent of the present invention is used, it is possible to prevent adhesion to sputtered products and peripheral members generated by welding.

  By applying and drying the spatter adhesion preventive agent of the present invention to the product and peripheral members, a ceramic film is formed and welding spatter is less likely to adhere. Therefore, as long as the ceramic coating is not destroyed and removed, the effect of preventing spatter adhesion continues.

  However, since this ceramic film is dry but does not pass through the baking process, it can be easily removed with an organic solvent such as alcohols, ketones or glycol ethers. Therefore, even if the spatter adhesion preventing agent is applied to the product, it can be removed thereafter without affecting the subsequent process of the product.

  Therefore, it can be applied not only to the peripheral members of the welding machine but also to products, and is suitable for all members where spatters fly.

  In addition, a transparent film is originally formed, but by adding inorganic material particles, the coated portion can be recognized when coated for coloring. When coloration is disliked, the additive filler may be eliminated, and by adding a nano-size filler, a spatter adhesion preventing agent that maintains transparency can be prepared.

  As described above, the spatter adhesion preventive agent of the present invention solves all the conventional problems described above.

It is a figure which shows the structure at the time of apply | coating a spatter adhesion inhibitor. It is the figure which showed roughly evaluation of sputter adhesion.

  The following examples are given for the purpose of illustrating the invention and are not intended to limit the invention to these embodiments.

<Evaluation of spatter adhesion>
As shown in the schematic diagram of FIG. 2, the sputter adherence evaluation was repeatedly performed until a portion 10 mm away from the coating portion was arc-welded and welding spatter adhered. The welding conditions were intentionally set so that a lot of spatter was generated (Table 1). SPCC steel was used as the adherend, and SS steel was used as the general steel.

<Example 1>
After 49.7 g of 1-propanol (hereinafter referred to as nPA) was added to 18.4 g of diethanolamine and stirred, 49.7 g of a zirconium n-propoxide / nPA (70% / 30%) solution was added and further stirred. 22.3 g of a solution in which nPA and ion-exchanged water were mixed at a weight ratio of 10: 1 was added thereto, and 7.1 g of boron nitride filler was added to 28.4 g of nPA in advance to dissolve 1.8 g of hydroxypropylcellulose. 0.1 g was added and stirred. Thereafter, filtration was performed to obtain a spatter adhesion preventing agent. This spatter adhesion inhibitor was applied to an adherend with a commercially available spray nozzle and dried at room temperature for 10 minutes.

<Example 2>
The spatter adhesion inhibitor prepared in the same manner as in Example 1 was collected in a spray can and filled with the same volume of dimethyl ether to obtain an aerosol type spatter adhesion inhibitor. This aerosol-type spatter adhesion inhibitor could be sprayed without separation or aggregation when mixed with a propellant gas (dimethyl ether). This spatter adhesion preventing agent was applied to the adherend and dried at room temperature for 10 minutes.

<Example 3>
115.65 g of diethanolamine was added to 156.3 g of titanium tetraisopropoxide, and the volume was increased to 630 ml with nPA. Thereafter, the mixture was stirred at 100 ° C. for 3 hours, and 200 ml of a solution in which nPA and ion-exchanged water were mixed at a weight ratio of 10: 1 was added and further stirred. Thereafter, 25 g of alumina particles (particle size: 0.2 μm) was added, and dispersion treatment was performed for 5 hours with a ball mill (zirconia ball 2 mmφ), followed by filtration to obtain a spatter adhesion preventive agent. This spatter adhesion preventing agent was applied to the adherend with a brush and dried at room temperature for 10 minutes.

<Comparative Example 1>
Similarly to Example 1 described in Patent Document 3, 17.8 g of methyltriethoxysilane and 20.8 g of tetraethyl orthosilicate were added to 9.5 g of glycidoxypropyltrimethoxysilane, and then acidic alumina sol (manufactured by Nissan Chemical Co., Ltd.) was added. 41.4 g was added and the mixture was stirred and dispersed in a ball mill for 24 hours. The sputter adhesion inhibitor thus obtained was evaluated by welding as in the other examples. Moreover, it apply | coated with the commercially available spray nozzle and dried for 30 minutes at normal temperature.

<Comparative example 2>
A commercially available aerosol type anti-sputtering agent (manufactured by Trusco Nakayama, for α-sputter clean torch nozzle) was applied to the adherend, and welding was performed and evaluated in the same manner as in the other examples.

  From Table 2, in Examples 1 to 3, adhesion of weld spatter is not observed even when the number of repetitions is 20 times or more. In the comparative example, welding spatter was adhered several times, and it was confirmed that the spatter adhesion preventing property was remarkably improved as compared with the conventional example.

Claims (4)

  Spatter adhesion preventive agent containing inorganic film forming liquid. The inorganic film forming liquid is
M ^{p +} (OR ¹ ) _q R ² _p-q
Wherein M is at least one element selected from the group consisting of Al, Zr and Ti; p represents the valence of M; R ¹ is a hydrocarbon group having 1 to 5 carbon atoms, alkoxyalkyl R ² is at least one organic group selected from the group consisting of vinyl, amino, imino, epoxy, acryloyloxy, methacryloyloxy, phenyl, mercapto and alkyl groups; q is OR ¹ Represents the number of groups; p and q are both integers; p ≧ q.)
The spatter adhesion preventing agent according to claim 1, comprising a hydrolyzate / polycondensate of the compound represented by the formula:   The spatter adhesion preventing agent according to claim 1 or 2, wherein the inorganic film-forming liquid further contains inorganic material particles.   The spatter adhesion preventing agent according to claim 3, wherein the inorganic material particles are boron nitride particles.