JPH02200395A - Spatter sticking preventing agent - Google Patents

Abstract

PURPOSE:To improve the working efficiency of a welding stage by using the addition product of the maleic anhydride of an ethylene/propylene copolymer, surfactant and water as essential components to constitute the spatter sticking preventive agent. CONSTITUTION:The aq. spatter sticking preventive agent is constituted essentially of the addition product of the maleic anhydride of an ethylene/propylene copolymer, the surfactant and the water. This aq. spatter sticking preventive agent is applied mainly for the nozzle of semi-automatic and automatic inert gas shielded arc welding. The working environment for welding is improved in this way.

Description

[Detailed description of the invention] Industrial applications The present invention relates to an aqueous sputter adhesion inhibitor.

The aqueous spatter adhesion inhibitor of the present invention is mainly applied to semi-automatic and automatic inert gas shielded arc welding nozzles.

Prior Art During gas-shielded arc welding operations, spatter generated adheres to the inner and outer surfaces of the nozzle, melting or clogging the nozzle. Therefore, it is not possible to perform stable welding work unless the adhering spatter is removed manually or the nozzle is replaced with a new one every time a short period of work is completed. This significantly hinders the improvement of welding work productivity. are doing.

Therefore, in order to improve the productivity of welding work, conventionally, spatter adhesion prevention agents were applied to keep the inner and outer surfaces of the nozzle clean, thereby extending the life of the nozzle.

The aim is to improve the operating rate of the welding process.

Conventionally, nonaqueous types and aqueous types have been used as spatter adhesion inhibitors.

In general, non-aqueous types are those made by dissolving one or more synthetic resins such as alkyd resins, acrylic resins, or polyurethane resins in organic solvents, or pastes based on petrolatum, which has a low melting point. It is used.

In addition, as water-based agents, those based on surfactants, or sputter adhesion prevention agents emulsified with mineral oil or fats and oils are used.

Among these, the non-aqueous type has the odor and toxicity of organic solvents, and has recently been developed due to the problem that the heat during welding significantly worsens the working environment due to the odor and toxicity of decomposition products of organic solvents. In this field, water-based sputter adhesion inhibitors are frequently used. Note that since it is difficult to apply paste-like products evenly, the prevention effect is uneven.

Therefore, the paste-like sputter adhesion prevention agent is not suitable for the process of manufacturing mass-produced products.

Some of the water-based types significantly improve the working environment, but on the other hand, they have not been able to provide a fully satisfactory spatter adhesion prevention effect.

Problems to be Solved by the Invention It is an object of the present invention to provide an aqueous sputter adhesion prevention agent that is excellent in preventing spatter adhesion on the inner and outer surfaces of a nozzle and can improve the working environment.

Means for Solving the Problems In order to solve the above problems, the present inventors have conducted extensive research and found that by incorporating a maleic anhydride adduct of an ethylene-propylene copolymer into an aqueous sputter adhesion inhibitor, It was discovered that the sputter adhesion prevention properties of the aqueous spatter adhesion prevention agent were significantly improved, and the present invention was completed.

That is, the present invention is an aqueous sputter adhesion inhibitor containing an ethylene-propylene copolymer maleic anhydride adduct, a surfactant, and water as essential components.

The details of the invention will be explained below.

(Main component) The maleic anhydride adduct of a copolymer of ethylene and propylene is prepared by using a copolymer of ethylene and propylene obtained by the method disclosed in JP-A No. 57-123205 as a raw material. , JP-A No. 61-12612
A liquid modified product obtained by grafting maleic anhydride as disclosed in Japanese Patent No. 0 can be used.

That is, the ethylene component is 30 mol% to 75 mol%
Ethylene with a number average molecular weight of 400 to 5.000.
A suitable grafting ratio of maleic anhydride to 100 parts by weight of the propylene copolymer is 0.2 to 50 parts by weight. It is effective if the amount added is 5% by weight or more in the aqueous sputtering prevention agent.

(Incorporation of Water) The aqueous sputter adhesion inhibitor of the present invention can be obtained by incorporating the above-mentioned compound in water.

If the amount of water contained in the aqueous spatter adhesion inhibitor is less than 50% by weight, the emulsion or dispersion will greatly thicken, resulting in problems with its workability. Therefore, considering workability, economy, etc., it is preferable to mix 50% to 70% water by weight.

(Surfactant) As the surfactant, either an anionic surfactant or a nonionic surfactant can be used. In particular, when a polyoxyethylene adduct of nonylphenol or an ethylene oxide adduct of a linear higher alcohol having 12 to 18 carbon atoms is applied, the emulsion stability or dispersion stability is improved. The number of moles of ethylene oxide added is preferably about 2 to 12 moles. In addition, in order to ensure stability of the stock solution, it is desirable that the amount of surfactant added be 1% by weight or more based on the non-volatile content.

(Other components) In addition to the essential components, the sputter adhesion preventive agent of the present invention contains mineral oil, which is known as a component of an aqueous spatter adhesion preventive agent.
Animal and vegetable oils, fatty acid esters, synthetic lubricating oils, waxes, etc. may be used in combination.

EXAMPLES Next, the present invention will be specifically explained with reference to Examples and Comparative Examples. However, the present invention is not limited in any way by these Examples and Comparative Examples.

Example 1 The following ingredients were placed in a mixing tank, heated to +30"C,
The mixture was stirred for 5 minutes using a stirrer. The mixture thus obtained was gradually added to 69 g of water at 95°C while stirring to obtain an aqueous anti-adhesion agent of the present invention.

(Component) Maleic anhydride adduct of copolymer of ethylene and propylene (Lucant A551 manufactured by Mitsui Petrochemical Industries, Ltd.)
5 + average molecular weight of 1.600 and acid value: j40)
10g mineral oil (with kinematic viscosity of 480 mrn”/s at 40°C)
6g rapeseed oil
7g nonylphenol adduct with 6 moles of ethylene oxide
6g 7 nonylphenol adduct with 12 moles of ethylene oxide
1g morpholine
1g water
69g Example 2 Example! In the same manner as above, a sputter adhesion inhibitor having the following composition was obtained.

(Ingredients) Maleic anhydride adduct of copolymer of ethylene and propylene (Lucant A59 manufactured by Mitsui Petrochemical Industries, Ltd.)
15: Average molecular weight is 1.600 and acid value is 60)
14g mineral oil (with a kinematic viscosity of 480 mrd/s at 40°C) g nonylphenol adduct with 6 moles of ethylene oxide

3g oxidized polyethylene wax (melting point 11
Those with an acid value of 15 at 0°C>
3g morpholine 2g water
aog comparative example-1 Mineral oil (with a kinematic viscosity of 480 mrd/s at 40°C) 3g rapeseed oil 7g nonylphenol adduct with 6 moles of ethylene oxide

6g nonylphenol adduct with 12 moles of ethylene oxide 1g oleic acid 3g morpholine g water 9g Comparative Example 2 Mineral oil (with a kinematic viscosity of 480 mrr?/s at 40°C) 8g adduct of nonylphenol with 6 moles of ethylene oxide

3g oxidized polyethylene wax (melting point 11
(with an acid value of 15 at 0°C)
3g oleic acid 4g
Morpholine 2g water

60gThe following performance evaluation was performed. The results are shown in Table 1.

Performance evaluation method After adjusting the nozzle that was immersed and dried at room temperature for each sample solution, the nozzle was attached to a welding machine, welding was performed, and the number of times until normal welding could not be performed due to adhesion of spatter was measured.

Table 1 (Usage form) The above composition is used by applying it to the nozzle surface using a method such as an injection lubricating device or an air spray dumping method.

(Performance evaluation) Regarding the compositions of the above examples and comparative examples.

The anti-spatter adhesion agent of Example 2 was continuously tested for 4 months using a welding machine on a practical line, and it was applied without problems for almost the same number of weldings whether the dilution ratio was 1x, 2x or 2x. I was able to do it. During the test, there was almost no odor and no duct fires were detected.

Effects of the Invention The aqueous spatter adhesion prevention agent of the present invention is excellent in spatter adhesion prevention ability and can improve the operating rate of the welding process.

Furthermore, the aqueous spatter adhesion prevention agent of the present invention has the effect of preventing the generation of odors and duct fires, etc., and can significantly improve the work environment.

Applicant: Koushiro Chemical Industry Co., Ltd.

Claims (1)

[Claims] An aqueous sputter adhesion inhibitor that contains a maleic anhydride adduct of ethylene/propylene copolymer, a surfactant, and water as essential ingredients.