JP3072324B2 - Weld spatter adhesion inhibitor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a coating agent for preventing spatter generated when arc welding steel or the like from adhering to a base metal or the like in the vicinity of welding, that is, a welding spatter. The present invention relates to an anti-adhesion agent, and more particularly to a type which removes by degreasing after use.

[Prior art] Conventionally, as a spatter adhesion inhibitor for welding, there are a direct coating type in which a coating is directly applied over the coating while leaving the coating after welding, and a coating thinner or an alkali after welding. And a degreasing cleaning type that removes by degreasing with an acid or the like.

The present invention relates to the latter type of cleaning. Conventional types of this type can be classified into the following three types, but each has its own drawbacks.

The first type is a dispersion type in which an inorganic powder such as talc, calcium carbonate, magnesium carbonate, and titanium oxide is used as a main component and a thickener is added thereto and dispersed in a solvent such as water. The point is that the number of agitation work steps is increased, and the powder is scattered at the time of washing, resulting in environmental deterioration, and furthermore, there are disadvantages such as difficulty in treating the washing waste liquid.

The second type is a type in which silicon is used as a main component and is dissolved in a solvent or is dispersed in water as an emulsion using a surfactant. The silicon type is difficult to remove unless a highly toxic acid such as nitric acid or hydrofluoric acid is used when removing it after use. In addition, if the pickling is performed for a long time, the silicon film will re-adhere, causing unevenness in removal. Exists.

The third type uses a water-soluble resin such as polyvinyl alcohol or polyethylene glycol as a main component. This generates a portion where the resin is carbonized by welding heat, and the carbonized portion is converted to an acid or an alkali. However, they have the disadvantage that they are difficult to dissolve and cause defective removal, and when they are applied from above without being removed, poor adhesion occurs.

[Problems to be Solved by the Invention] The present invention has been made for the purpose of developing a spatter adhesion preventive agent having no problems as described above. It can be easily removed, does not leave any problems in the post-process, does not deteriorate the working environment, has excellent original spatter adhesion prevention properties, has high heat resistance, and is free from suspended matter in a cleaning solution tank such as acid or alkali. It is an object of the present invention to provide a welding spatter adhesion preventive agent having various properties such as being able to be used for a long time without causing precipitation.

[Means for Solving the Problems] In order to achieve the above object, a combination of various salts of metal inorganic acids such as boric acid, molybdic acid, tungstic acid and a surfactant is used as a cleaning type welding spatter adhesion inhibitor. Upon testing, it was found that those blended in a predetermined range had excellent performance.

That is, the present invention relates to an alkali metal salt of a metal inorganic acid, an alkaline earth metal salt, an amine salt, and one or more metal inorganic acid salts selected from ammonium salts in an amount of 5 to 35% by weight,
And 1 to 20% by weight of a surfactant as an essential component.

The metal inorganic acid in the present invention includes boric acid, aluminate, silicic acid, stannic acid, titanic acid, chromic acid, molybdic acid, tungstic acid, manganic acid, and the like, and these are used as various salts as described below. is there.

That is, alkali metal salts such as sodium, potassium and lithium salts of metal inorganic acids, alkaline earth metal salts such as calcium salts and magnesium salts, and also metal inorganic acids selected from amine salts and ammonium salts One or more of the salts are used.

In the case of using an alkali metal borate, for example, a caustic alkali solution may be mixed with boric acid, or boron oxide may be used as an alkali metal borate by dissolving boron oxide in the caustic alkali solution. It is.

When used as the above amine salt or ammonium salt, various kinds of amines as described below can be used in addition to ammonia.

Lower (mono, di, tri) alkylamines Methylamine, ethylamine, propylamine, dimethylamine, diethylamine, dipropylamine, dibutylamine, n-butylmethylamine, trimethylamine, tributylamine, methyldiethylamine, etc. Cyclic amines morpholine , Pyrrolidine, piperidine, etc. Diamines hydrazine, methylhydrazine, 2-3 toluenediamine, ethylenediamine, etc. Substituted amines hydroxyylamine, ethanolamine, diethanolamine, butanolamine, hexanolamine,
Polyamines such as methyldiethanolamine, octanolamine, diglycolamine, other polyglycolamine, triethanolamine, methylethanolamine, n-aminoethanolamine, etc.Polyamines diethylenetriamine, triethylenetetramine, hexamethylenetetramine, etc. One or two or more selected from metal inorganic acid salts of the above and a surfactant are blended as essential components, and the blending ratio of the metal inorganic acid salt must be 5 to 35% by weight. I have.

If the mixing ratio of the metal inorganic acid salt is less than 5% by weight, the effect of preventing spatter adhesion is reduced. On the other hand, if the mixing ratio is more than 35% by weight, welding defects such as blowholes and pits may occur when the alloy enters a welding bead. This is easy to generate, and the washing performance by the thinner is deteriorated.

Next, as the surfactant to be blended in the present invention,
Although any of nonionic, anionic, cationic and amphoteric surfactants can be used, nonionic surfactants are more likely to provide suitable results.

Examples of the nonionic surfactant include polyoxyethylene alkyl ethers such as polyoxyethylene lauryl ether, polyoxyethylene alkyl phenol ethers such as polyoxyethylene nonylphenol ether, and polyoxyethylenes such as polyoxyethylene monostearate. And polyoxyethylene sorbitan monoalkyl esters such as ethylene alkyl ester and polyoxyethylene sorbitan monolaurate.

Examples of the anionic surfactant include an alkyl carboxylate fatty acid soap such as rosin soap, an alkyl sulfate such as sodium dodecylbenzenesulfonate, and an alkyl alcohol sulfate.

As the cationic surfactant, N-alkyltrimethylenediamine salt, dialkyldimethylammonium chloride, polyoxyethylene alkylamine and the like can be used.

Further, examples of the amphoteric surfactant include alkylbenzyldimethylammonium, laurylbetaine, imidazoliniumbetaine, distearyldimethylammonium chloride and the like.

Such surfactants are used alone or in combination as appropriate in a composition containing the metal inorganic acid salt as a main component, and the compounding ratio is in the range of 1 to 20% by weight. If it is less than 1% by weight, it becomes difficult to remove the metal inorganic acid salt in the case of thinner cleaning after use. On the other hand, if this proportion exceeds 20% by weight, carbides are easily generated by welding heat, Are difficult to remove in the washing step.

The metal inorganic acid salt and the surfactant in the present invention are mixed and dissolved in an appropriate solvent within the above-mentioned concentration range, and the solvent is not particularly limited, but may be water alone or water-soluble alcohol. The water-soluble alcohols include methanol, ethanol, isopropanol, ethylene glycol, glycerin, and derivatives thereof.

When actually applying the spatter adhesion inhibitor of the present invention, an appropriate amount of a rust inhibitor, a thickener, a leveling agent, a coloring agent, a fragrance, etc. are added within a range that does not impair the performance according to the use conditions. They may be used in combination.

[Action] The present invention is a welding spatter adhesion inhibitor having the above-mentioned structure, and the metal inorganic acid salt as a main component has high heat resistance, is hardly decomposed even by welding heat, and has a heat history due to welding. Even in the pickling or alkali washing process, it can be easily removed by dissolving in the process of washing with acid.Also, when this spatter adhesion inhibitor is washed by immersion in acid or alkali, no floating substances or precipitates are generated in the washing liquid tank. The cleaning liquid can be used for a long time.

In addition, a surfactant mixed in an appropriate amount with the metal inorganic acid salt easily removes the film of the metal inorganic acid salt even in the thinner washing step, and the action of the surfactant allows the film of the metal inorganic acid salt to be removed. Is uniformly adhered to the welding base metal.

The uniform film having high heat resistance reliably prevents spatter from adhering to the base material, eliminates poor appearance after coating and poor appearance after plating, and eliminates the cause of rust.

Further, as described above, the inhibitor of the present invention can be easily removed after use in a washing step such as pickling or alkali washing, so that there is no problem in subsequent steps, there is no scattering of powder or contamination by a washing solution, and workability and environmental protection are not caused. The nature is also excellent.

[Examples] Examples 1 to 6 in which various metal inorganic acid salts of the following a to f and various surfactants of I to C were blended as shown in Table 1, and a comparison in which they were blended as shown in Table 2. Examples 1 to 4 were each prepared.

Metal inorganic acid salt (each inorganic acid + each alkali solution) a ... sodium borate b ... monoethanolamine borate c ... diethanolamine aluminate d ... magnesium aluminate e ... sodium molybdate f ... ammonium tungstate surfactant A: Polyoxyethylene lauryl ether B: Polyoxyethylene dodecyl phenyl ether C: Monoalkyl quaternary ammonium salt Each of the compositions shown in Tables 1 and 2 was applied to the welding base metal by brush coating, and a welding test was performed under the following welding conditions.

Welding conditions Carbon dioxide gas arc welding Weld a 9mm thick mild steel plate with a T-shaped fillet Welding current …… 300A Arc voltage… 30V Welding speed …… 50cm / min Wire diameter… 1.2mmφ Gas flow …… 20 / min Evaluation Welding Thereafter, the number of spatters deposited and the number of pits generated in 100 cm ² were measured for the test of each composition, and the detergency of each composition with a thinner, an acid and an alkali was tested.

 Table 3 shows the results.

The symbols in the table indicate the following contents.

 ◎: Good detergency with no decomposition products.

 …: Decomposed product remains slightly, but there is no problem in the subsequent process.

 Δ: A little film remains, causing problems in the post-process.

 ×: Most of the film remains and the film cannot be removed.

From Table 3, it can be seen that the examples of the present invention show excellent spatter adhesion prevention properties, have no welding defects, and exhibit excellent film cleaning properties in any of thinner, acid and alkali. It is done.

On the other hand, when both the amount of the metal inorganic acid salt and the amount of the surfactant are insufficient as in Comparative Example 1, the number of sputters increases, and the amount of the surfactant is insufficient as in Comparative Example 2. In the case, the thinner cleaning property was remarkably inferior, and Comparative Example 3
When the amount of the surfactant is too large as in Example 1, welding defects are generated, and the detergency by an acid or an alkali is deteriorated. In particular, and the washability with thinner and alkali is remarkably inferior.

[Effects of the Invention] The effects of the present invention are as detailed in the operation section, but are briefly summarized as follows.

(1) A spatter adhesion inhibitor which does not decompose even by welding heat due to the high heat resistance of the metal inorganic acid salt as the main component.

(2) Therefore, after use, it can be easily washed with a cleaning agent such as an acid, an alkali, and a thinner, so that there is no problem in the subsequent steps.

(3) When this composition is washed by immersing it in an acid or alkali, it can be used for a long period of time without causing suspended matters or precipitates in the washing solution.

(4) It is easy to apply to the welding base material, becomes a uniform film, and has excellent spatter adhesion prevention properties.

(5) Workability and environmental performance are also good.

As described above, the spatter adhesion inhibitor of the present invention has various excellent effects and exhibits extremely high utility in the field of welding technology.

Claims (1)

(57) [Claims] 1. An inorganic acid salt of an alkali metal, an alkaline earth metal, an amine salt or an ammonium salt selected from the group consisting of an alkali metal salt, an alkali metal salt, an amine salt and an ammonium salt. 20 to 20% by weight as an essential component.