JPH10279835A - Adhesion preventive for welding sputter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an adhesion preventive for welding sputter which can form a quickly drying uniform film by compounding an org.-solvent soln. contg. a high-molecular substance as the main ingredient with a specified amt. of n-propyl bromide. SOLUTION: At least one high-molecular substance selected from among poly(meth)acrylic acid and salts thereof, polyvinyl alcohol, methylated or ethylated methylolmelamine, polyvinylpyrrolidone, etc., is dissolved in a solvent selected from among arom. solvents (e.g. toluene), ester solvents (e.g. ethyl acetate), ketone solvents (e.g. methyl ethyl ketone), etc. The resultant soln. is compounded. based on 100 pts.wt. high-molecular substance, with 10-700 pts.wt. n-propyl bromide as a nonflammable org. solvent and if necessary further with a pigment (e.g. calcium carbonate), a metal powder (e.g. a copper powder), a surfactant, a dispersant, a stabilizer, etc., to give an adhesion preventive for welding sputter. Having a low b.p., i.e., a high volatility, n-propyl bromide dries in a short time when applied to a metallic material.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-adhesion agent for welding spatter, and to prevent spatter generated when a metal material is subjected to carbon dioxide arc welding or manual welding from adhering around a base material. Of
In particular, it relates to a resin liquid composition containing a polymer material as a main component.

[0002]

2. Description of the Related Art Conventionally, alkyd resins, acrylic resins, melamine resins,
BACKGROUND ART A resin in which a resin such as an epoxy resin or a modified material thereof is dissolved in an organic solvent such as toluene or mineral spirit is widely used.

[0003] However, these oil-based resin liquid types have poor drying properties after being applied to a metal material, and it takes a long time to form a uniform film. As a result, the efficiency of the welding operation is low, and when applied to the vertical surface of the metal material, the resin liquid drips, and the welding liquid may enter the groove of welding and cause welding defects such as blow holes and pits.

[0004] Therefore, it has been conventionally practiced to mix a fast-drying organic solvent to enhance the drying property. The organic solvent used here is required to have a low boiling point, to be fast-drying, to be nonflammable, and to have low toxicity. In the past, CFC-based solvents were used. However, in recent years, the problem of global warming and destruction of the ozone layer due to CFC-based substances has been highlighted, and the use of CFC-based solvents has been greatly restricted.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and it is an object of the present invention to add a non-fluorocarbon-based non-flammable organic solvent to an oily resin liquid to reduce the environmental impact of the earth. An object of the present invention is to provide a welding spatter adhesion inhibitor which forms a quick-drying and uniform film without causing a problem of destruction.

[0006]

According to the present invention, there is provided a solution of an organic solvent containing a polymer as a main component in an amount of 10 to 700 parts by weight of normal propyl based on 100 parts by weight of a solid content of the polymer. It is characterized by containing bromide.

[0007] The polymer substance in the present invention is not particularly limited, but its form must be an organic solvent solution.

[0008] Examples of high molecular substances include polyacrylic acid or polymethacrylic acid or salts thereof, polyvinyl alcohol, methylated or ethylated methylolmelamine resin, methylolated urea resin, methylolated phenolic resin, methylolated resorcinol resin, polyvinylpyrrolidone. , Polyvinyl ether, polyacrylic acid or polymethacrylic acid amide or methylolated product thereof, nitrogen-containing acrylic acid or methacrylic acid copolymer acid adduct, other acrylic acid or methacrylic acid copolymer, urethane resin, acrylic resin Resin, epoxy resin, melamine resin, urea resin, polyester resin, alkyd resin, xylene resin, vinyl chloride resin, vinylidene chloride resin, furan resin, vinyl acetate resin, resorcin resin, resin Nord resin, butadiene resin, more can be used, such as modified products thereof. Natural or synthetic rubber can also be used. Further, these polymer substances may be used alone or in combination of two or more.

As the organic solvent solution of these polymer materials, the above-mentioned polymer materials may be used in the form of aromatic solvents such as toluene and xylol, ester solvents such as ethyl acetate and butyl acetate, and ketones such as MEK and MIBK. Solvent, D
A solvent dissolved in an ether solvent such as IPE or DBE or a hydrocarbon solvent such as mineral spirit can be used.

The present invention is characterized in that normal propyl bromide as a nonflammable organic solvent is blended with the oily resin liquid containing the high molecular substance as a main component.

Normal propyl bromide was once considered a flammable solvent having a flash point,
At present, it has been confirmed that it is nonflammable, has low toxicity to the human body, and has an extremely small effect on destruction of the ozone layer and global warming.

The amount of the normal propyl bromide in the present invention can be used in the range of 10 to 700 parts by weight, preferably 50 to 50 parts by weight, based on 100 parts by weight of the solid content of the polymer substance in the oily resin liquid. ５００500 parts by weight. The amount of normal propyl bromide added is 1
If the amount is less than 0 parts by weight, drying of the obtained welding spatter adhesion inhibitor becomes slow, and the effect of the present invention cannot be sufficiently obtained.

If the amount of normal propyl bromide exceeds 700 parts by weight, the coating of the welding spatter adhesion inhibitor becomes non-uniform, cracks are formed, the effect of preventing the adhesion of spatter is reduced, and the rust prevention is also reduced. I do.

The anti-weld spatter adhesion inhibitor of the present invention includes, in addition to the above components, pigments such as calcium carbonate and talc, metal powders such as aluminum paste and copper powder, surfactants and dispersants, if necessary. In addition, a gelling inhibitor, a curing agent, a preservative, a stabilizer and the like can be appropriately compounded.

Particularly, when metal powder such as aluminum paste or copper powder is used, the stability of the composition is easily lost. Therefore, nitro compounds such as nitromethane and nitropropane, 1,2-epoxybutane, 1,4 -It is preferable to add oxides such as dioxane.

[0016]

According to the welding spatter adhesion inhibitor of the present invention,
Normal propyl bromide contained therein has a low boiling point and high volatility, so when it is applied to the surface of a metal material, normal propyl bromide volatilizes with an organic solvent and dries in a short time. .

[0017]

Thus, according to the present invention, when a welding spatter adhesion inhibitor is applied to a metal material, the metal material is quickly dried and the welding operation can be performed in a short time. Also, when coated on a vertical surface, there is no dripping, a uniform and tough film is formed, no spatter or fume is attached, and an excellent adhesion preventing effect is obtained.

Further, since a uniform film is formed by drying in a short time, no solvent remains in the film, no rust is generated on the metal material, the rust-preventing effect is excellent, and the adhesion of spatter is prevented. The agent does not hinder welding, and defects such as blow holes and pits do not occur.

Further, normal propyl bromide is nonflammable and has low toxicity to the human body, so that it does not cause fire or solvent poisoning even if it volatilizes in the air. Normal propyl bromide is one of the alkyl halides. However, it is not considered to cause destruction of the ozone layer or global warming, and can be used without any problem.

[0020]

【Example】

[Example 1] Preparation of oily resin liquid An organic solvent solution type oily resin liquid containing an alkyd resin as a main component was prepared according to the following composition.

Mineral spirit solution of alkyd resin (solid content: 40%) 50 parts by weight Calcium carbonate 5 parts by weight Talc 5 parts by weight Dispersant 0.5 parts by weight Hardener 0.5 parts by weight Gelling inhibitor 0.5 parts by weight Xylol 38.5 parts by weight Total 100 parts by weight

Preparation of Weld Spatter Adhesion Prevention The above oily resin liquid was mixed with normal propyl bromide according to the composition shown in Table 1 to prepare a welding spatter adhesion prevention agent.

[0023]

[Table 1] *: Many cracks are formed and a uniform film cannot be formed.

Example 2 Preparation of Oily Resin Liquid An organic solvent solution type oily resin liquid containing an acrylic resin as a main component was prepared with the following composition.

Acrylic resin xylol solution (solid content 50%) 40 parts by weight Aluminum paste 5 parts by weight Talc 5 parts by weight Dispersant 0.5 parts by weight Hardener 0.5 parts by weight Gelling inhibitor 0.5 parts by weight Ethyl acetate 48.5 parts by weight Total 100 parts by weight

Preparation of Weld Spatter Adhesion Prevention The above oily resin liquid was mixed with normal propyl bromide in accordance with the composition shown in Table 2 to prepare a weld spatter adhesion prevention agent.

[0027]

[Table 2] *: Many cracks are formed and a uniform film cannot be formed.

[Performance Test] Examples 1 and 2 above
, The following performance test was performed on the sample of each sample number.

Drying Test A 150 mm × 300 mm × 2 mm shot steel plate was used as a test piece, and a welding spatter adhesion preventive agent of each sample number was applied to a half area of the surface using a bar coater having a wet film thickness of 30 μm. Immediately, the test piece was set upright so that the coated part was on the top, supported on a support table, and tested for dryness. The time required to dry to the touch was measured, and the presence or absence of rust and the state of dripping during that time were observed.

Welding test In addition, 300 mm × 150 mm × 6.5 mm S
The steel sheet of S-41 was used as a test piece, and the welding spatter adhesion preventive agent of each sample number was spray-coated on the surface of the welding side with a spray gun so that the dry film thickness became about 10 μm.
After drying at a temperature of 10 minutes, using a carbon dioxide gas fully automatic welding machine, using a welding wire of DSI-1.6φ,
The welding was performed by a T-type horizontal fillet method under the conditions of a current of 360 A, a voltage of 32 V, a welding speed of 50 cm / min, and a carbon dioxide gas flow rate of 20 liter / min.

Thereafter, the number of spatters adhering to the surface of the welding base metal was counted, and a V-notch of 2 mm was formed in the welded portion. The results of each test are shown in Tables 1 and 2, respectively.

[Evaluation] As can be understood from the test results, Sample Nos. 1-1 and 2-1 did not contain normal propyl bromide, so that the time required for touch-drying was long and the dripping occurred. Has also occurred.

On the other hand, sample numbers 1-2 to 1-4 and 2
In Nos. 2-2 to 2-4, in a wide range of the compounding range of normal propyl bromide, the finger touch time was short and no dripping occurred.

In Sample Nos. 1-5 and 2-5, since the amount of normal propyl bromide was too large, a large number of cracks were formed and a continuous and uniform film was not formed. Due to the adhesion, it is not a suitable welding spatter adhesion inhibitor.

In the welding test, the sample number 1-
In Nos. 1, 2-1 and 1-5, 2-5, spatter adhesion was observed, and blow holes and pits were generated. However, no spatter adhesion was found within the scope of the present invention. Since neither blowholes nor pits are generated, it can be seen that the film has an extremely excellent effect of preventing spatter adhesion.

Claims (1)

[Claims] 1. An organic solvent solution containing a polymer substance as a main component is added in an amount of 10 parts by weight to 100 parts by weight of a solid content of the polymer substance.
Welding spatter adhesion inhibitor characterized by containing ~ 700 parts by weight of normal propyl bromide