JPH0460000B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Application Field] The present invention relates to an aqueous spatter adhesion prevention agent mainly applied to the nozzles of semi-automatic and automatic inert gas shielded arc welding machines. [Prior art] Spatter generated during gas shield arc welding adheres to the inner and outer surfaces of the nozzle, melting or clogging the nozzle, and requiring manual removal of the adhering spatter after each short work period. There is a problem in that stable welding cannot be performed unless the welding part is removed or replaced with a new one, which significantly impedes productivity improvement. Therefore, spatter adhesion prevention agents are used to constantly clean the inner and outer surfaces of the nozzle to extend the life of the nozzle and improve the operating rate of the welding process. In general, non-aqueous spatter adhesion prevention agents are composed of one or more synthetic resins such as alkyd resin, acrylic resin, or polyurethane resin and dissolved in an organic solvent, or are based on petrolactam with a low melting point. A paste-like product is used. In addition, the aqueous type is based on a surfactant or emulsified with mineral oil or fat. Among these, the non-aqueous type has the odor and toxicity of an organic solvent, and is also known to significantly deteriorate the working environment due to the odor and toxicity of decomposed products of the organic solvent generated by heat during welding. Moreover, it is difficult to always apply a paste-like product uniformly, the spatter adhesion prevention effect is uneven, and the durability is poor. On the other hand, all of the water-based types significantly improve the working environment, but on the other hand, none have been able to provide a fully satisfactory spatter adhesion prevention effect. [Problems to be Solved by the Invention] An object of the present invention is to provide an aqueous spatter adhesion prevention agent that is excellent in the effect of 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 inventors of the present invention, as a result of intensive research, added a wettability improver to wax and found that the emulsified wax emulsion has an effect of preventing spatter adhesion. They discovered that the invention is superior and completed the present invention. That is, the present invention provides a wax component containing at least 50% by weight of wax having a melting point of 60°C or higher.
The present invention relates to an aqueous spatter adhesion prevention agent containing 100 parts by weight and 0.5 to 30 parts by weight of an alkali-soluble resin as a wettability improver. The present invention also provides a wax component containing at least 50% by weight of wax with a melting point of 60°C or higher.
The present invention relates to an aqueous spatter adhesion prevention agent containing 100 parts by weight and 0.005 to 1 part by weight of a fluorine-based surfactant as a wettability improver. The configuration of the present invention will be explained in detail below. Wax Almost all waxes used in conventional wax compositions having a melting point of 60° C. or higher can be used. In addition, when a wax with a melting point of less than 60°C is used in combination, adding at least 50% by weight of a wax with a melting point of 60°C or higher to the wax component will make it easier to use than a wax with a melting point of 60°C or higher. Almost the same spatter adhesion prevention effect can be obtained. However, if it is less than 50% by weight, the spatter adhesion prevention effect will be poor and work efficiency will be reduced. In addition, if the wax component with a melting point of 60°C or more contains 25% by weight or more of an acid value of 5 or more, the emulsion stability during use or storage is excellent, so the effect of preventing spatter adhesion is reduced over time. It's very preferable. On the other hand, if the amount is less than 25% by weight, the emulsion may separate over time and the effect of preventing spatter adhesion cannot be achieved. As the wax having a melting point of 60° C. or higher, natural and synthetic hydrocarbon waxes, modified products and oxides thereof, mineral waxes, animal and vegetable waxes, and modified products thereof can be used. Examples of hydrocarbon waxes include paraffin wax, microcrystalline wax, fiberglass wax, low molecular weight polyethylene wax, low molecular weight polypropylene wax, ethylene-α-olefin copolymer, and ethylene-monoethylene wax. Examples include unsaturated acid copolymers.
Mineral waxes include, for example, montan wax; animal and vegetable waxes include carnauba wax, candelilla wax, serrata wax, and beeswax; fatty acids include, for example, palmitic acid, stearic acid, behenic acid, and Stearic acid, etc. Modified products and oxides of the above-mentioned waxes include Hoechst wax, Sasol wax, oxidized microcrystalline wax, esterified products thereof, and oxidized polyethylene. Waxes with a melting point of 60°C or higher and an acid value of 5 or higher include the above carvana wax, candelilla wax, beeswax, montan wax, palmitic acid, stearic acid, behenic acid, oxystearic acid, oxidized microcrystalline wax, and ethylene. - monoethylenically unsaturated acid copolymers, polyethylene oxide, etc. Wettability Improver As the wettability improver, an alkali-soluble resin and a fluorine-containing surfactant can be used. Examples of alkali-soluble resins include maleated rosin ester, styrene-maleic acid resin (molecular weight
1000 to 5000) and alkali metal salts, ammonium salts, and amine salts of acrylic low molecular weight resins. Examples of amines include methylamine, ethylamine, morpholine, methylmorpholine, and ethylmorpholine, but morpholine is superior in that it has emulsifying power and has relatively little odor. The amount of alkali-soluble resin added is based on the wax component.
The amount is 0.5 to 30 parts by weight per 100 parts by weight. If it is less than 0.5 part by weight, the wettability to the nozzle will be poor and the wax emulsion will not be able to adhere uniformly. Moreover, if it exceeds 30 parts by weight, the spatter adhesion prevention effect will be poor. The amount of fluorine-based surfactant added is based on the wax component.
The amount is 0.005 to 1 part by weight per 100 parts by weight.
If it is less than 0.005 parts by weight, the desired performance cannot be obtained;
Further, even if the amount exceeds 1 part by weight, the effect will not be improved, which is uneconomical. Other ingredients In addition to the wax ingredients and wettability improvers mentioned above,
Various additives such as emulsifiers, amines necessary to emulsify oxidized waxes, rust preventives, antifoaming agents, preservatives, etc. can be added as necessary. Manufacturing method and usage method To manufacture the composition of the present invention, a mixture of the wax component and an emulsifier or amine added thereto as necessary is heated to 100 to 120°C to melt it, and the mixture is melted at 90°C or higher. A preliminary emulsion is created by gradually adding the mixture into water while stirring. Next, this is homogenized to make the emulsion particles fine. After rapidly cooling the emulsion at 90° C. or higher obtained in this manner to a temperature close to room temperature, a stable emulsion composition is prepared by adding the wettability improver while stirring and uniformly dispersing it. . The above composition can be used in injection lubricating equipment, air spray,
It is used by applying it to the nozzle surface by a method such as depping. [Example] Next, the present invention will be described with reference to Examples in order to make the present invention easier to understand. However, the following examples do not limit the present invention in any way. In the following description, parts represent parts by weight, and % represents weight %. Example 1 Carnauba wax ^*1 4 parts Microcrystalline wax ^*2 4 parts Polyethylene oxide wax ^*3 4 parts Stearic acid 3.5 parts Caustic soda 0.5 parts Morpholine 2 parts Water 62 parts Ammonium salt of maleated rosin ester (active ingredient 15) %) 20 parts *1: Melting point 84°C, acid value 6, iodine value 10 *2: Melting point 82°C *3: Melting point 106°C, acid value 15, average molecular weight 3000 The wax mixture and emulsifier are heated to 120°C and dissolved. This was then gradually poured into water heated to 95°C with stirring to prepare a preliminary emulsion. Next, emulsify using a homogenizer (manufactured by Gaulin) (processing pressure 5000 psi), and use a heat exchanger to emulsify.
After rapidly cooling to 40° C., ammonium salt of maleated rosin ester was added with stirring to obtain a uniform emulsion composition having the above composition. Example 2 Polyethylene wax ^*4 4 parts Microcrystalline wax ^*5 3 parts Oxidized polyethylene wax ^*6 5 parts Stearic acid monoglyceride 1 part Oleic acid 2 parts Morpholine 1 part Water 64 parts Ammonium salt of styrene-maleic acid resin ^*
7 (Active ingredient 20%) 20 parts *4: Melting point 100°C, molecular weight 500 *5: Melting point 55°C *6: Melting point 104°C, acid value 20 *7: Product name Oxirac SH-101 (manufactured by Nippon Shokubai Kogyo Co., Ltd.) The same operation as in Example 1 was repeated to prepare an emulsion composition having the above composition. Example 3 Polyethylene oxide ^*8 12 parts Polyoxyethylene nonyl phenyl ether (EO = 8.5 mol) 3 parts Caustic potash 0.7 part Water 84 parts Fluorine surfactant ^*9 0.05 part *8: melting point 138°C, acid value 30 *9: Trade name Florado FC129 (manufactured by Sumitomo 3M) The same operation as in Example 1 was repeated to prepare an emulsion composition having the above composition. Comparative Example 1 A wax emulsion having a composition similar to that of Example 1 except that the ammonium salt of maleated rosin ester was removed was prepared in the same manner as in Example 1. Comparative Example 2 A wax emulsion having a composition similar to that of Example 3 except for Florade FC129 was prepared in the same manner as in Example 3. Comparative Example 3 Machine oil 80 parts Petroleum sulfonate 8.5 parts Oleic acid 4 parts Sorbitan sesquiolate 3 parts Coconut oil fatty acid diethanolamide 3 parts Triethanolamine 1.5 parts Machine oil with petroleum sulfonate, oleic acid, sorbitan sesquiolate, and coconut oil fatty acid diethanolamide and triethanolamine were blended in the above amounts, heated to 80° C. with stirring, and then cooled to prepare a composition. This composition was diluted 5 times and 10 times with water and used as samples. Performance Evaluation The compositions of the above Examples and Comparative Examples were subjected to the following performance evaluation. The results are shown in Table 1. The performance evaluation method is as follows. Performance evaluation method After preparing a nozzle that was immersed in each sample solution and dried at room temperature, the nozzle was attached to a welding machine and welding was performed, and the number of times until normal welding could not be performed due to adhesion of spatter was measured.

【table】

〔Effect of the invention〕

(1) The aqueous spatter adhesion prevention agent of the present invention has an excellent spatter adhesion prevention effect, and by using it, the operation rate of the welding process is significantly improved. (2) It has been confirmed in a practical production line that by applying the aqueous spatter adhesion prevention agent of the present invention, the working environment can be significantly improved and the fire safety of ducts is excellent.

Claims (1)

[Scope of Claims] 1. An aqueous spatter adhesion prevention agent containing 100 parts by weight of a wax component containing at least 50% by weight of wax having a melting point of 60° C. or more and 0.5 to 30 parts by weight of an alkali-soluble resin as a wettability improver. 2. The aqueous spatter adhesion prevention agent according to claim 1, wherein 25% by weight or more of the wax having a melting point of 60° C. or higher has an acid value of 5 or higher. 3. Claim 1, wherein the alkali-soluble resin is one or more selected from alkali metal salts, ammonium salts, and amine salts of maleated rosin esters, styrene-maleic acid resins, and acrylic low-molecular-weight resins. Or the aqueous spatter adhesion prevention agent according to item 2. 4 100 parts by weight of a wax component containing at least 50% by weight of wax with a melting point of 60°C or higher and 0.005 to 1 part of a fluorine-based surfactant as a wettability improver.
Water-based spatter adhesion prevention agent containing parts by weight. 5. The aqueous spatter adhesion inhibitor according to claim 4, wherein 25% by weight or more of the wax having a melting point of 60° C. or higher has an acid value of 5 or higher.