JPS6331518B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a method for preventing metal corrosion in aerosol products. Aerosol products are generally made by dispersing the desired main component and subcomponents in water, alcohol, or other organic solvent by dissolving or suspending them, and then placing this and liquefied or compressed gas as a propellant in an airtight container. However, when metal containers are used, corrosion often occurs, degrading the quality of the aerosol product. Moreover, the strength of the container itself is reduced and it may burst, which not only makes it impossible to maintain its commercial value, but also often poses a safety problem. Further, for example, when the aerosol product is a coating product such as paint or an adhesive, it is a matter of course that it is necessary to prevent corrosion when used on metal. As a method for preventing metal corrosion in such aerosol products, attempts have been made to add various anticorrosive agents, and a number of substances have been proposed, but there are few that have significant effects. In particular, many of these concerns the prevention of corrosion caused by decomposition due to moisture and other influences when halogenated hydrocarbons such as chlorinated hydrocarbons, fluorinated hydrocarbons, and chlorinated fluorinated hydrocarbons are used as propellants, and this area But there are very few things that are completely satisfying. Furthermore, recently, triggered by the so-called fluorocarbon regulations in the United States, attempts to use propellants other than halogenated hydrocarbons have increased.For example, various attempts have been made to use dimethyl ether as a propellant, but in particular, in aerosol products. Corrosion often occurs in the presence of water, and in this case corrosion can also occur in the gas phase inside the container, so it is desired to establish a method for preventing it. Among these metal corrosion prevention methods, the present inventors have studied various corrosion prevention methods when the aerosol composition contains dimethyl ether and water, and have developed a method of adding alkali metal salts of various inorganic and organic acids. The present invention was achieved by discovering that this is effective. The alkali salts of various inorganic and organic acids used in the present invention are so-called inorganic acids, carboxylic acid groups, thioacid groups in which one or two of the oxygen atoms of the carboxylic acid group are replaced with sulfur atoms, sulfonic acid groups,
Organic compounds with acidic groups such as sulfinic acid groups, thiosulfate groups, and phenolic hydroxyl groups, and their derivatives with added alcoholic hydroxyl groups, ether groups, cyano groups, nitro groups, halogens, etc., when used in aerosol products. It does not have other substituents that have a detrimental effect. Examples of inorganic and organic acids that are considered to constitute the salts used in the present invention include hydrochloric acid, sulfuric acid, sulfurous acid, thiosulfuric acid, nitric acid, nitrous acid, carbonic acid, phosphoric acid, hydrogen sulfide, chlorosulfonic acid, and sulfamine. Acids etc. are mainly used. Further, as the organic acids, carboxylic acids, acidic sulfuric esters, sulfonic acids, sulfinic acids, and aromatic phenols are mainly used. Examples of organic acids include formic acid,
Acetic acid, propionic acid, valeric acid, lauric acid, myristic acid, palmitic acid, stearic acid, trimethylacetic acid, acrylic acid, crotonic acid, oleic acid, elaidic acid, linoleic acid, linolenic acid, mono- or di- or trichloroacetic acid, glycolic acid , thioglycolic acid, lactic acid, β-oxypropionic acid, glyoxylic acid, oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, malic acid, tartaric acid, maleic acid, fumaric acid, tricarballylic acid,
Phenyl acetic acid, benzoic acid, toluic acid, salicylic acid, gallic acid, phthalic acid, isophthalic acid, terephthalic acid, sulfostearic acid, methyl sulfate, other alkyl sulfates, methanesulfonic acid, dodecane sulfonic acid, octadecane sulfonate Acids and other alkyl sulfonic acids, isethionic acids,
These include methylsulfuric acid, cetylsulfuric acid, octadecylsulfuric acid, sulfonated products of oleic acid, benzenesulfonic acids, toluenesulfonic acids, carbolic acid, cresol, resorcinol, nitrophenol, phenolsulfonic acid, and mixtures thereof. Note that it is a matter of course that partially neutralized products of dibasic acids or more can be used. Although the amount of alkali metal salts used in the present invention cannot be specifically stated, it is usually appropriate to use 0.0001 to 10% by weight, preferably 0.001 to 5% by weight, and more preferably 0.001 to 5% by weight, based on the total amount of the aerosol product. It is 0.005 to 2% by weight. In the present invention, when preparing an aerosol product by filling each component of an aerosol product into a container, the alkali metal salt alone or an appropriate diluent or an aerosol can be added before, during, after, or simultaneously with other components. This can be carried out by charging the alkali metal salt into a container by pre-mixing it with any component in the product, and, if necessary, adding an operation to promote mixing with other components. It is also possible to adjust the PH using an appropriate acid or base, if necessary. The method of the present invention can be applied to various aerosol products using dimethyl ether as a propellant, such as homogeneous phase type, emulsion type, suspension type, etc., but it is particularly effective for aerosol products using dimethyl ether as a propellant and using water. Since dimethyl ether is flammable, it is generally necessary to reduce its flammability in aerosol products using it as a propellant. Since water is the simplest and cheapest method for this purpose,
The effects of the present invention are extremely large. Hairspray, deodorant,
It is possible to significantly reduce the corrosiveness of various aerosol products such as anti-inflammatory agents to metals such as aluminum, tinplate, and iron used in their containers. The present invention will be explained in more detail below with reference to Examples. Example 1 After mixing a specified amount of additives with 53g of water, ethanol
Add 40g to a 220ml tin aerosol can, then add 40g of dimethyl ether,
Leave it at 45℃ for 3 months and observe whether rust has formed.
I got the following results.

[Table] Example 2 The same test as in Example 1 was conducted, except that the following additives were used in the following amounts, and no rust was observed in any of the tests. 2.2'-methylenebis(6-tert-butyl-4-ethylphenol) sodium salt 0.3% by weight Sodium salt of mono- and di(polyoxyethylene dinonyl phenyl ether) phosphate ester
0.3% by weight Sodium salt of mono- and di(polyoxyethylene lauryl ether) phosphate ester 0.3% by weight
and 0.3% by weight of sodium benzoate.

Claims (1)

[Claims] 1. A method for preventing metal corrosion in an aerosol product, which comprises adding at least one selected from alkali metal salts to an aerosol product containing dimethyl ether and water as propellants.